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v3.23.3

Securities - Amortized Cost and Fair Value, Held to Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 1,245,627 | $ 1,324,072
Gross Unrealized Gains | 0 | 17
Gross Unrealized Losses | (166,504) | (117,549)
Fair Value | 1,079,123 | 1,206,540
Allowance for credit losses - held to maturity securities | (32) | (32)
Held to maturity securities, net of allowance for credit losses | 1,245,595 | 1,324,040
Obligations of states and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 289,053 | 291,886
Gross Unrealized Gains | 0 | 17
Gross Unrealized Losses | (57,660) | (48,325)
Fair Value | 231,393 | 243,578
Residential mortgage backed securities: |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 395,441 | 423,315
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (49,030) | (30,706)
Fair Value | 346,411 | 392,609
Residential mortgage backed securities: | Government agency mortgage backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 440,227 | 483,560
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (41,350) | (24,432)
Fair Value | 398,877 | 459,128
Commercial mortgage backed securities: | Government agency mortgage backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 16,989 | 17,006
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3,800) | (3,261)
Fair Value | 13,189 | 13,745
Commercial mortgage backed securities: | Government agency collateralized mortgage obligations |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 44,725 | 45,430
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (8,235) | (6,559)
Fair Value | 36,490 | 38,871
Other debt securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 59,192 | 62,875
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (6,429) | (4,266)
Fair Value | $ 52,763 | $ 58,609

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