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Investment Securities (Gross Unrealized Losses and Fair Value by Length of Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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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 | $ 40,723 | $ 26,788
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 836 | 150
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 18,693 | 236
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 488 | 1
Available-for-sale securities, continuous unrealized loss position, fair value | 59,416 | 27,024
Available-for-sale securities, continuous unrealized loss position, unrealized losses | 1,324 | 151
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, fair value | 217,414 | 12,237
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 2,863 | 63
Held-to-maturity securities, continuous unrealized loss position, fair value | 217,414 | 12,237
Held-to-maturity securities, continuous unrealized loss position, unrealized losses | 2,863 | 63
Mortgage-backed [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 37,837 | 11,869
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 723 | 68
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 3,947 |
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 23 |
Available-for-sale securities, continuous unrealized loss position, fair value | 41,784 | 11,869
Available-for-sale securities, continuous unrealized loss position, unrealized losses | 746 | 68
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, fair value | 155,548 | 5,093
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 2,302 | 18
Held-to-maturity securities, continuous unrealized loss position, fair value | 155,548 | 5,093
Held-to-maturity securities, continuous unrealized loss position, unrealized losses | 2,302 | 18
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 2,886 | 14,919
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 113 | 82
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 14,746 | 236
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 465 | 1
Available-for-sale securities, continuous unrealized loss position, fair value | 17,632 | 15,155
Available-for-sale securities, continuous unrealized loss position, unrealized losses | 578 | 83
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, fair value | 61,371 | 6,646
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 556 | 43
Held-to-maturity securities, continuous unrealized loss position, fair value | 61,371 | 6,646
Held-to-maturity securities, continuous unrealized loss position, unrealized losses | 556 | 43
Other debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, fair value | 495 | 498
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 5 | 2
Held-to-maturity securities, continuous unrealized loss position, fair value | 495 | 498
Held-to-maturity securities, continuous unrealized loss position, unrealized losses | $ 5 | $ 2

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