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Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale securities: |  |
Amortized Cost | $ 120,832 | $ 95,999
Gross Unrealized Gains | 69 | 7
Gross Unrealized Losses | 10,380 | 12,419
Investment securities - AFS | 110,521 | 83,587
Held-to-maturity securities: |  |
Amortized Cost | 513,282 | 559,455
Gross Unrealized Gains | 57 | 35
Gross Unrealized Losses | 55,509 | 64,863
Estimated Fair Value | 457,830 | 494,627
U.S. Treasury and government agencies |  |
Available-for-sale securities: |  |
Amortized Cost | 23,472 | 21,798
Gross Unrealized Gains | 5 | 5
Gross Unrealized Losses | 3,002 | 3,625
Investment securities - AFS | 20,475 | 18,178
Held-to-maturity securities: |  |
Amortized Cost | 143,442 | 148,097
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 10,377 | 13,601
Estimated Fair Value | 133,065 | 134,496
Mortgage-backed securities |  |
Available-for-sale securities: |  |
Amortized Cost | 91,280 | 72,183
Gross Unrealized Gains | 5 | 2
Gross Unrealized Losses | 7,258 | 8,666
Investment securities - AFS | 84,027 | 63,519
Held-to-maturity securities: |  |
Amortized Cost | 357,870 | 398,884
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 43,864 | 50,464
Estimated Fair Value | 314,006 | 348,420
Obligations of states and political subdivisions |  |
Held-to-maturity securities: |  |
Amortized Cost | 1,470 | 1,474
Gross Unrealized Gains | 57 | 35
Gross Unrealized Losses | 19 | 28
Estimated Fair Value | 1,508 | 1,481
Other debt securities |  |
Available-for-sale securities: |  |
Amortized Cost | 6,080 | 2,018
Gross Unrealized Gains | 59 | 0
Gross Unrealized Losses | 120 | 128
Investment securities - AFS | 6,019 | 1,890
Held-to-maturity securities: |  |
Amortized Cost | 10,500 | 11,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,249 | 770
Estimated Fair Value | $ 9,251 | $ 10,230

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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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