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Securities - Securities with Unrealized Losses Aggregated by Investment Category and Time with Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | $ 29,937 | $ 153,118
Less than 12 months, unrealized losses | 1,658 | 15,751
More than 12 months, fair value | 503,911 | 375,245
More than 12 months, unrealized losses | 79,717 | 73,290
Total, fair value | 533,848 | 528,363
Total, unrealized losses | 81,375 | 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 | 79,975 | 78,204
More than 12 months, unrealized losses | 10,720 | 12,606
Total, fair value | 79,975 | 78,204
Total, unrealized losses | 10,720 | 12,606
State and Municipal [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | 2,481 | 89,158
Less than 12 months, unrealized losses | 25 | 12,612
More than 12 months, fair value | 233,517 | 140,390
More than 12 months, unrealized losses | 44,616 | 34,939
Total, fair value | 235,998 | 229,548
Total, unrealized losses | 44,641 | 47,551
Mortgage-backed [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | 26,955 | 63,249
Less than 12 months, unrealized losses | 1,626 | 3,093
More than 12 months, fair value | 178,182 | 144,318
More than 12 months, unrealized losses | 23,822 | 25,047
Total, fair value | 205,137 | 207,567
Total, unrealized losses | 25,448 | 28,140
Corporate [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | 501 | 711
Less than 12 months, unrealized losses | 7 | 46
More than 12 months, fair value | 215 | 0
More than 12 months, unrealized losses | 35 | 0
Total, fair value | 716 | 711
Total, unrealized losses | 42 | 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 | 12,022 | 12,333
More than 12 months, unrealized losses | 524 | 698
Total, fair value | 12,022 | 12,333
Total, unrealized losses | $ 524 | $ 698

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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