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Investment Securities (Gross Unrealized Losses and Fair Value by Length of Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | $ 2,814 | $ 32,180
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 38 | 2,541
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 77,953 | 50,752
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 11,197 | 9,878
Available-for-sale securities, continuous unrealized loss position, fair value | 80,767 | 82,932
Available-for-sale securities, continuous unrealized loss position, unrealized losses | 11,235 | 12,419
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, fair value |  | 224,974
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, unrealized losses |  | 12,625
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, fair value |  | 268,951
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, unrealized losses |  | 52,238
Held-to-maturity securities, continuous unrealized loss position, fair value |  | 493,925
Held-to-maturity securities, continuous unrealized loss position, unrealized losses |  | 64,863
Mortgage-backed |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 1,754 | 29,125
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 32 | 2,409
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 59,277 | 34,167
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 7,747 | 6,290
Available-for-sale securities, continuous unrealized loss position, fair value | 61,031 | 63,292
Available-for-sale securities, continuous unrealized loss position, unrealized losses | 7,779 | 8,699
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, fair value |  | 148,771
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, unrealized losses |  | 9,402
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, fair value |  | 199,649
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, unrealized losses |  | 41,062
Held-to-maturity securities, continuous unrealized loss position, fair value |  | 348,420
Held-to-maturity securities, continuous unrealized loss position, unrealized losses |  | 50,464
U.S. Government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 1,060 | 1,165
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 6 | 4
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 16,833 | 16,585
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 3,277 | 3,588
Available-for-sale securities, continuous unrealized loss position, fair value | 17,893 | 17,750
Available-for-sale securities, continuous unrealized loss position, unrealized losses | 3,283 | 3,592
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, fair value |  | 67,332
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, unrealized losses |  | 2,786
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, fair value |  | 67,163
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, unrealized losses |  | 10,815
Held-to-maturity securities, continuous unrealized loss position, fair value |  | 134,495
Held-to-maturity securities, continuous unrealized loss position, unrealized losses |  | 13,601
Other debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value |  | 1,890
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses |  | 128
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 1,843 |
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 173 |
Available-for-sale securities, continuous unrealized loss position, fair value | 1,843 | 1,890
Available-for-sale securities, continuous unrealized loss position, unrealized losses | $ 173 | 128
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, fair value |  | 8,091
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, unrealized losses |  | 409
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, fair value |  | 2,139
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, unrealized losses |  | 361
Held-to-maturity securities, continuous unrealized loss position, fair value |  | 10,230
Held-to-maturity securities, continuous unrealized loss position, unrealized losses |  | 770
States and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value |  | 780
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses |  | 28
Available-for-sale securities, continuous unrealized loss position, fair value |  | 780
Available-for-sale securities, continuous unrealized loss position, unrealized losses |  | $ 28

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