Quarterly report [Sections 13 or 15(d)]

Note 5 - Loans - Summary of Loans (Details)

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Note 5 - Loans - Summary of Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Total loans $ 13,311,967   $ 12,605,836      
Less allowance for credit losses (170,235) $ (169,959) (164,458) $ (160,755) $ (158,092) $ (153,317)
Net Loans $ 13,141,732   $ 12,441,378      
Financing receivable, gross percentage 100.00%   100.00%      
Commercial Real Estate Portfolio Segment [Member]            
Total loans $ 2,945,784   $ 2,869,894      
Financing receivable, gross percentage 22.13%   22.77%      
Real Estate Portfolio Segment[Member]            
Total loans $ 8,754,061   $ 8,173,009      
Less allowance for credit losses (66,983) (68,060) (67,726) (64,756) (59,684) (55,126)
Real Estate Portfolio Segment[Member] | Construction Loans [Member]            
Total loans 1,532,285   1,489,306      
Less allowance for credit losses $ (42,080) (46,423) $ (38,597) (37,358) (40,450) (44,658)
Financing receivable, gross percentage 11.51%   11.81%      
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]            
Total loans $ 2,680,055   $ 2,547,143      
Less allowance for credit losses $ (20,177) (20,927) $ (22,302) (20,003) (19,039) (17,702)
Financing receivable, gross percentage 20.13%   20.21%      
Real Estate Portfolio Segment[Member] | One to Four Family [Member]            
Total loans $ 1,625,296   $ 1,444,623      
Less allowance for credit losses $ (15,568) (14,944) $ (14,096) (14,710) (13,629) (12,029)
Financing receivable, gross percentage 12.21%   11.46%      
Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member]            
Total loans $ 4,448,710   $ 4,181,243      
Less allowance for credit losses $ (31,238) (32,189) $ (31,328) (30,043) (27,016) (25,395)
Financing receivable, gross percentage 33.42%   33.17%      
Real Estate Portfolio Segment[Member] | Other Mortgages [Member]            
Total loans     $ 8,173,009      
Financing receivable, gross percentage 65.76%   64.84%      
Consumer Portfolio Segment [Member]            
Total loans $ 79,837   $ 73,627      
Less allowance for credit losses $ (3,075) $ (2,454) $ (2,805) $ (1,603) $ (1,742) $ (1,412)
Financing receivable, gross percentage 0.60%   0.58%