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Note 3 - Investment Securities - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Securities HTM: |  |
Securities HTM, Amortized Cost | $ 587,322 | $ 472,583
Securities HTM, Gross Unrealized Gains | 5,292 | 49,715
Securities HTM, Gross Unrealized (Losses) | (56,978) | (1)
Securities HTM, Fair Value | 535,636 | 522,297
Securities held to maturity, at amortized cost, net of allowance for credit losses | 587,142 | 472,385
Allowance for credit losses HTM securities | 180 | 198
Securities AFS: |  |
Securities AFS, Amortized Cost | 400,511 | 329,994
Securities AFS, Gross Unrealized Gains | 160 | 9,157
Securities AFS, Gross Unrealized (Losses) | (59,711) | (1,321)
Securities AFS, Fair Value | 340,960 | 337,830
U.S. treasuries and govt. sponsored agency securities |  |
Securities AFS: |  |
Securities AFS, Amortized Cost | 19,745 | 23,370
Securities AFS, Gross Unrealized Gains | 19 | 254
Securities AFS, Gross Unrealized (Losses) | (2,783) | (296)
Securities AFS, Fair Value | 16,981 | 23,328
Residential mortgage-backed and related securities |  |
Securities AFS: |  |
Securities AFS, Amortized Cost | 73,438 | 92,431
Securities AFS, Gross Unrealized Gains |  | 2,672
Securities AFS, Gross Unrealized (Losses) | (7,223) | (780)
Securities AFS, Fair Value | 66,215 | 94,323
Municipal securities. |  |
Securities HTM: |  |
Securities HTM, Amortized Cost | 586,272 | 471,533
Securities HTM, Gross Unrealized Gains | 5,292 | 49,715
Securities HTM, Gross Unrealized (Losses) | (56,978) |
Securities HTM, Fair Value | 534,586 | 521,248
Allowance for credit losses HTM securities | 180 | 198
Securities AFS: |  |
Securities AFS, Amortized Cost | 239,812 | 163,253
Securities AFS, Gross Unrealized Gains | 66 | 5,228
Securities AFS, Gross Unrealized (Losses) | (46,700) | (215)
Securities AFS, Fair Value | 193,178 | 168,266
Asset-backed securities |  |
Securities AFS: |  |
Securities AFS, Amortized Cost | 18,885 | 26,372
Securities AFS, Gross Unrealized Gains | 48 | 752
Securities AFS, Gross Unrealized (Losses) | (205) |
Securities AFS, Fair Value | 18,728 | 27,124
Other securities |  |
Securities HTM: |  |
Securities HTM, Amortized Cost | 1,050 | 1,050
Securities HTM, Gross Unrealized (Losses) |  | (1)
Securities HTM, Fair Value | 1,050 | 1,049
Securities AFS: |  |
Securities AFS, Amortized Cost | 48,631 | 24,568
Securities AFS, Gross Unrealized Gains | 27 | 251
Securities AFS, Gross Unrealized (Losses) | (2,800) | (30)
Securities AFS, Fair Value | $ 45,858 | $ 24,789

X
- Definition Amount, before other than temporary impairment accretion, of investment in debt securities measured at amortized cost held to maturity net of allowance for credit losses. + References No definition available. + Details
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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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