v3.26.1
Note 4 - Investment Securities - Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Investment securities available for sale, amortized cost $ 1,737,212 $ 1,735,451
Investment securities available for sale, gross unrealized gains 382 1,142
Investment securities available for sale, gross unrealized losses 54,774 78,370
Securities AFS 1,682,820 1,658,223
US Treasury Securities [Member]    
Investment securities available for sale, amortized cost 936,776 827,763
Investment securities available for sale, gross unrealized gains 0 430
Investment securities available for sale, gross unrealized losses 312 0
Securities AFS 936,464 828,193
US Government Corporations and Agencies Securities [Member]    
Investment securities available for sale, amortized cost 1,102 5,888
Investment securities available for sale, gross unrealized gains 50 52
Investment securities available for sale, gross unrealized losses 107 118
Securities AFS 1,045 5,822
Collateralized Mortgage-Backed Securities [Member]    
Investment securities available for sale, amortized cost 723,516 704,213
Investment securities available for sale, gross unrealized gains 282 548
Investment securities available for sale, gross unrealized losses 52,945 75,324
Securities AFS 670,853 629,437
US Government-sponsored Enterprises Debt Securities [Member]    
Investment securities available for sale, amortized cost   25,000
Investment securities available for sale, gross unrealized gains   11
Investment securities available for sale, gross unrealized losses   0
Securities AFS   25,011
Collateralized Mortgage Obligations [Member]    
Investment securities available for sale, amortized cost 5,818 24,454
Investment securities available for sale, gross unrealized gains 0 0
Investment securities available for sale, gross unrealized losses 1,194 1,706
Securities AFS 4,624 22,748
Corporate Debt Securities [Member]    
Investment securities available for sale, amortized cost 70,000 148,133
Investment securities available for sale, gross unrealized gains 50 101
Investment securities available for sale, gross unrealized losses 216 1,222
Securities AFS $ 69,834 $ 147,012