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Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022
--- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, Amortized Cost | $ 89,846 |  | $ 95,999 |
Available-for-sale securities, Amortized Cost | 89,846 |  |  |
Available-for-sale securities, Gross Unrealized Gains | 5 |  | 7 |
Available-for-sale securities, Gross Unrealized Losses | 11,782 |  | 12,419 |
Available-for-sale, at fair value (amortized cost of 89,846 (2023) and $95,999 (2022)) | 78,069 |  | 83,587 |
Held-to-maturity Securities, Amortized Cost | 537,133 |  | 559,455 |
Held-to-maturity securities, Gross Unrealized Gains | 39 |  | 35 |
Held-to-maturity securities, Gross Unrealized Losses | 63,876 |  | 64,863 |
Held-to-maturity securities, Estimated Fair Value | 473,296 |  | 494,627 | $ 494,627
Held to maturity, allowance for credit losses | 163 | $ 163 |  |
Equity securities, at fair value | 1,245 |  | 1,233 |
Collateral Pledged |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, Amortized Cost | 65,500 |  | 83,300 |
Held-to-maturity Securities, Amortized Cost | 166,200 |  | 19,200 |
U.S. Government agencies |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, Amortized Cost |  |  | 21,798 |
Available-for-sale securities, Amortized Cost | 21,465 |  |  |
Available-for-sale securities, Gross Unrealized Gains | 5 |  | 5 |
Available-for-sale securities, Gross Unrealized Losses | 3,408 |  | 3,625 |
Available-for-sale, at fair value (amortized cost of 89,846 (2023) and $95,999 (2022)) | 18,062 |  | 18,178 |
Held-to-maturity Securities, Amortized Cost | 144,882 |  | 148,097 |
Held-to-maturity securities, Gross Unrealized Losses | 13,035 |  | 13,601 |
Held-to-maturity securities, Estimated Fair Value | 131,847 |  | 134,496 |
States and political subdivisions |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Held-to-maturity Securities, Amortized Cost | 1,472 |  | 1,474 |
Held-to-maturity securities, Gross Unrealized Gains | 39 |  | 35 |
Held-to-maturity securities, Gross Unrealized Losses | 30 |  | 28 |
Held-to-maturity securities, Estimated Fair Value | 1,481 |  | 1,481 |
Mortgage-backed |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, Amortized Cost |  |  | 72,183 |
Available-for-sale securities, Amortized Cost | 66,367 |  |  |
Available-for-sale securities, Gross Unrealized Gains |  |  | 2 |
Available-for-sale securities, Gross Unrealized Losses | 8,188 |  | 8,666 |
Available-for-sale, at fair value (amortized cost of 89,846 (2023) and $95,999 (2022)) | 58,179 |  | 63,519 |
Held-to-maturity Securities, Amortized Cost | 379,779 |  | 398,884 |
Held-to-maturity securities, Gross Unrealized Losses | 49,407 |  | 50,464 |
Held-to-maturity securities, Estimated Fair Value | 330,372 |  | 348,420 |
Other debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, Amortized Cost |  |  | 2,018 |
Available-for-sale securities, Amortized Cost | 2,014 |  |  |
Available-for-sale securities, Gross Unrealized Losses | 186 |  | 128 |
Available-for-sale, at fair value (amortized cost of 89,846 (2023) and $95,999 (2022)) | 1,828 |  | 1,890 |
Held-to-maturity Securities, Amortized Cost | 11,000 |  | 11,000 |
Held-to-maturity securities, Gross Unrealized Losses | 1,404 |  | 770 |
Held-to-maturity securities, Estimated Fair Value | 9,596 |  | $ 10,230 |
Held to maturity, allowance for credit losses | $ 163 |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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