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Securities - Securities with Unrealized Losses Aggregated by Investment Category and Time with Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | $ 4,628 | $ 153,118
Less than 12 months, unrealized losses | 195 | 15,751
More than 12 months, fair value | 476,167 | 375,245
More than 12 months, unrealized losses | 91,997 | 73,290
Total, fair value | 480,795 | 528,363
Total, unrealized losses | 92,192 | 89,041
U.S. Treasury Notes and Bonds [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | 0 | 0
Less than 12 months, unrealized losses | 0 | 0
More than 12 months, fair value | 77,032 | 78,204
More than 12 months, unrealized losses | 13,431 | 12,606
Total, fair value | 77,032 | 78,204
Total, unrealized losses | 13,431 | 12,606
State and Municipal [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | 529 | 89,158
Less than 12 months, unrealized losses | 35 | 12,612
More than 12 months, fair value | 212,185 | 140,390
More than 12 months, unrealized losses | 48,227 | 34,939
Total, fair value | 212,714 | 229,548
Total, unrealized losses | 48,262 | 47,551
Mortgage-backed [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | 4,099 | 63,249
Less than 12 months, unrealized losses | 160 | 3,093
More than 12 months, fair value | 174,956 | 144,318
More than 12 months, unrealized losses | 29,898 | 25,047
Total, fair value | 179,055 | 207,567
Total, unrealized losses | 30,058 | 28,140
Corporate [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | 0 | 711
Less than 12 months, unrealized losses | 0 | 46
More than 12 months, fair value | 709 | 0
More than 12 months, unrealized losses | 51 | 0
Total, fair value | 709 | 711
Total, unrealized losses | 51 | 46
Asset-backed Securities [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | 0 | 0
Less than 12 months, unrealized losses | 0 | 0
More than 12 months, fair value | 11,285 | 12,333
More than 12 months, unrealized losses | 390 | 698
Total, fair value | 11,285 | 12,333
Total, unrealized losses | $ 390 | $ 698

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