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Note 6 - Investment Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Total, available for sale, amortized cost $ 1,203,064 $ 1,086,972
Investment securities available for sale, gross unrealized gains 646 3,067
Investment securities available for sale, gross unrealized losses (204,189) (14,673)
Investment securities available for sale, at fair value 999,521 1,075,366
Investment securities held to maturity, at amortized cost 1,562,376 1,660,292
Investment securities held to maturity, gross unrealized gains 32 8,451
Investment securities held to maturity, gross unrealized losses (294,862) (21,383)
Investment securities held to maturity, at fair value 1,267,546 1,647,360
Equity securities (1) 6,627 9,173
Noncumulative Preferred Stock [Member]    
Equity securities (1) [1] 6,627 9,173
US Government Agencies Debt Securities [Member]    
Total, available for sale, amortized cost 19,806 25,671
Investment securities available for sale, gross unrealized gains 0 0
Investment securities available for sale, gross unrealized losses (1,411) (743)
Investment securities available for sale, at fair value 18,395 24,928
Investment securities held to maturity, at amortized cost 52,788 66,438
Investment securities held to maturity, gross unrealized gains 0 1,549
Investment securities held to maturity, gross unrealized losses (4,764) 0
Investment securities held to maturity, at fair value 48,024 67,987
Collateralized Mortgage Obligations [Member]    
Total, available for sale, amortized cost 388,019 375,570
Investment securities available for sale, gross unrealized gains 0 989
Investment securities available for sale, gross unrealized losses (67,004) (5,010)
Investment securities available for sale, at fair value 321,015 371,549
Investment securities held to maturity, at amortized cost 374,421 400,424
Investment securities held to maturity, gross unrealized gains 32 4,607
Investment securities held to maturity, gross unrealized losses (67,589) (8,803)
Investment securities held to maturity, at fair value 306,864 396,228
Agency Mortgage-backed Securities [Member]    
Total, available for sale, amortized cost 510,269 446,740
Investment securities available for sale, gross unrealized gains 10 254
Investment securities available for sale, gross unrealized losses (94,257) (5,511)
Investment securities available for sale, at fair value 416,022 441,483
Investment securities held to maturity, at amortized cost 1,135,167 1,193,430
Investment securities held to maturity, gross unrealized gains 0 2,295
Investment securities held to maturity, gross unrealized losses (222,509) (12,580)
Investment securities held to maturity, at fair value 912,658 1,183,145
US States and Political Subdivisions Debt Securities [Member]    
Total, available for sale, amortized cost 52,128 6,596
Investment securities available for sale, gross unrealized gains 1 344
Investment securities available for sale, gross unrealized losses (6,356) 0
Investment securities available for sale, at fair value 45,773 6,940
Corporate Debt Securities [Member]    
Total, available for sale, amortized cost 232,842 232,395
Investment securities available for sale, gross unrealized gains 635 1,480
Investment securities available for sale, gross unrealized losses (35,161) (3,409)
Investment securities available for sale, at fair value $ 198,316 $ 230,466
[1] Equity securities consist of investments in non-cumulative preferred stock.