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Note 4 - Investment Securities - Continuous Unrealized Loss Position (Details)
$ in Thousands
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Unrealized loss position, fair value, less than 12 months $ 7,742 $ 241,572
Unrealized loss position, unrealized losses, less than 12 months (445) (33,323)
Unrealized loss position, fair value, more than 12 months 564,374 361,297
Unrealized loss position, unrealized losses, more than 12 months (92,522) (70,521)
Unrealized loss position, fair value 572,116 602,869
Unrealized loss position, unrealized losses $ (92,967) $ (103,844)
Number of securities, less than 12 months 18 272
Number of securities, more than 12 months 419 213
Number of securities 437 485
US Government Agencies Debt Securities [Member]    
Unrealized loss position, fair value, less than 12 months $ 0 $ 9,285
Unrealized loss position, unrealized losses, less than 12 months 0 (377)
Unrealized loss position, fair value, more than 12 months 98,869 93,312
Unrealized loss position, unrealized losses, more than 12 months (13,100) (13,409)
Unrealized loss position, fair value 98,869 102,597
Unrealized loss position, unrealized losses $ (13,100) (13,786)
Number of securities 46  
US States and Political Subdivisions Debt Securities [Member]    
Unrealized loss position, fair value, less than 12 months $ 4,137 170,484
Unrealized loss position, unrealized losses, less than 12 months (252) (26,928)
Unrealized loss position, fair value, more than 12 months 267,258 112,353
Unrealized loss position, unrealized losses, more than 12 months (44,070) (25,835)
Unrealized loss position, fair value 271,395 282,837
Unrealized loss position, unrealized losses $ (44,322) (52,763)
Number of securities 255  
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Unrealized loss position, fair value, less than 12 months $ 3,605 61,803
Unrealized loss position, unrealized losses, less than 12 months (193) (6,018)
Unrealized loss position, fair value, more than 12 months 198,247 155,632
Unrealized loss position, unrealized losses, more than 12 months (35,352) (31,277)
Unrealized loss position, fair value 201,852 217,435
Unrealized loss position, unrealized losses $ (35,545) $ (37,295)
Number of securities 136