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Securities - Fair Value of Debt Security, Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost, available for sale | $ 582,987 | $ 618,790
Gross unrealized gains, available for sale | 9 | 0
Gross unrealized losses, available for sale | (92,192) | (89,041)
Fair value, available for sale | 490,804 | 529,749
Amortized cost, held to maturity | 414,743 | 425,906
Gross unrealized gains, held to maturity | 19 | 1
Gross unrealized losses, held to maturity | (80,137) | (72,006)
Fair value, held to maturity | 334,625 | 353,901
U.S. Treasury Notes and Bonds [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost, available for sale | 90,463 | 90,810
Gross unrealized gains, available for sale | 0 | 0
Gross unrealized losses, available for sale | (13,431) | (12,606)
Fair value, available for sale | 77,032 | 78,204
U.S. Government and Federal Agency [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Fair value, available for sale | 0 |
Amortized cost, held to maturity | 2,971 | 2,966
Gross unrealized gains, held to maturity | 0 | 0
Gross unrealized losses, held to maturity | (396) | (421)
Fair value, held to maturity | 2,575 | 2,545
State and Municipal [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost, available for sale | 260,976 | 277,489
Gross unrealized gains, available for sale | 0 | 0
Gross unrealized losses, available for sale | (48,262) | (47,551)
Fair value, available for sale | 212,714 | 229,938
Amortized cost, held to maturity | 196,580 | 201,890
Gross unrealized gains, held to maturity | 3 | 1
Gross unrealized losses, held to maturity | (42,986) | (39,355)
Fair value, held to maturity | 153,597 | 162,536
Mortgage-backed [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost, available for sale | 219,113 | 236,703
Gross unrealized gains, available for sale | 9 | 0
Gross unrealized losses, available for sale | (30,058) | (28,140)
Fair value, available for sale | 189,064 | 208,563
Amortized cost, held to maturity | 194,545 | 200,473
Gross unrealized gains, held to maturity | 0 | 0
Gross unrealized losses, held to maturity | (33,599) | (29,868)
Fair value, held to maturity | 160,946 | 170,605
Corporate [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost, available for sale | 760 | 757
Gross unrealized gains, available for sale | 0 | 0
Gross unrealized losses, available for sale | (51) | (46)
Fair value, available for sale | 709 | 711
Amortized cost, held to maturity | 20,005 | 19,603
Gross unrealized gains, held to maturity | 16 | 0
Gross unrealized losses, held to maturity | (3,117) | (2,285)
Fair value, held to maturity | 16,904 | 17,318
Asset-backed Securities [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost, available for sale | 11,675 | 13,031
Gross unrealized gains, available for sale | 0 | 0
Gross unrealized losses, available for sale | (390) | (698)
Fair value, available for sale | 11,285 | 12,333
Amortized cost, held to maturity | 642 | 974
Gross unrealized gains, held to maturity | 0 | 0
Gross unrealized losses, held to maturity | (39) | (77)
Fair value, held to maturity | $ 603 | $ 897

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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