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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Less than 12 months, estimated fair value $ 526,004 $ 417,733
Less than 12 months, unrealized losses (52,236) (6,174)
12 months or more, estimated fair value 254,006 10,085
12 months or more, unrealized losses (44,256) (329)
Total estimated fair value 780,010 427,818
Total unrealized losses (96,492) (6,503)
US Treasury Securities [Member]    
Less than 12 months, estimated fair value 119,179 163,206
Less than 12 months, unrealized losses (10,309) (2,083)
12 months or more, estimated fair value 88,907 0
12 months or more, unrealized losses (11,668) 0
Total estimated fair value 208,086 163,206
Total unrealized losses (21,977) (2,083)
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value 76,888 30,647
Less than 12 months, unrealized losses (6,433) (570)
12 months or more, estimated fair value 26,095 5,836
12 months or more, unrealized losses (3,947) (182)
Total estimated fair value 102,983 36,483
Total unrealized losses (10,380) (752)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Less than 12 months, estimated fair value 47,837 92,192
Less than 12 months, unrealized losses (5,541) (1,580)
12 months or more, estimated fair value 69,785 2,524
12 months or more, unrealized losses (14,225) (90)
Total estimated fair value 117,622 94,716
Total unrealized losses (19,766) (1,670)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 218,288 115,204
Less than 12 months, unrealized losses (23,921) (1,667)
12 months or more, estimated fair value 59,639 1,725
12 months or more, unrealized losses (12,127) (57)
Total estimated fair value 277,927 116,929
Total unrealized losses (36,048) (1,724)
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 63,812 16,484
Less than 12 months, unrealized losses (6,032) (274)
12 months or more, estimated fair value 9,580 0
12 months or more, unrealized losses (2,289) 0
Total estimated fair value 73,392 16,484
Total unrealized losses $ (8,321) $ (274)