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Securities - Amortized Cost and Fair Value, Held to Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 487,226 | $ 416,389
Gross Unrealized Gains | 0 | 334
Gross Unrealized Losses | (37,685) | (1,171)
Fair Value | 449,541 | 415,552
Allowance for credit losses - held to maturity securities | (32) | (32)
Held to maturity securities, net of allowance for credit losses | 487,194 | 416,357
Obligations of states and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 290,588 | 267,641
Gross Unrealized Gains | 0 | 333
Gross Unrealized Losses | (26,969) | (685)
Fair Value | 263,619 | 267,289
Residential mortgage backed securities: |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 23,403 | 24,832
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,904) | (92)
Fair Value | 21,499 | 24,740
Other debt securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 21,938 | 22,049
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,120) | (79)
Fair Value | 20,818 | 21,970
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 95,369 | 60,507
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (3,943) | (198)
Fair Value | 91,426 | 60,310
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 17,022 | 1,855
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,488) | 0
Fair Value | 15,534 | 1,855
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 38,906 | 39,505
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,261) | (117)
Fair Value | $ 36,645 | $ 39,388

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