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Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | $ 1,504,331 | $ 1,516,841
Gross Unrealized Gains | 3,828 | 5,424
Gross Unrealized Losses | (238,010) | (222,564)
Fair Value | 1,270,149 | 1,299,701
U.S. Treasury and U.S. government sponsored entities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 137,720 | 145,439
Gross Unrealized Gains | 12 | 113
Gross Unrealized Losses | (18,585) | (17,597)
Fair Value | 119,147 | 127,955
State and political subdivisions |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 612,030 | 644,880
Gross Unrealized Gains | 3,555 | 4,792
Gross Unrealized Losses | (98,144) | (93,503)
Fair Value | 517,441 | 556,169
Corporate bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 18,670 | 18,554
Gross Unrealized Gains | 146 | 187
Gross Unrealized Losses | (457) | (466)
Fair Value | 18,359 | 18,275
Mortgage-backed securities - residential |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 627,338 | 624,529
Gross Unrealized Gains | 15 | 1
Gross Unrealized Losses | (113,628) | (104,144)
Fair Value | 513,725 | 520,386
Collateralized mortgage obligations |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 105,510 | 80,227
Gross Unrealized Gains | 100 | 331
Gross Unrealized Losses | (6,880) | (6,559)
Fair Value | 98,730 | 73,999
Small Business Administration |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 3,063 | 3,212
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (316) | (295)
Fair Value | $ 2,747 | $ 2,917

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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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