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Investment Securities (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Securities available-for-sale |  |
Securities, Amortized Cost | $ 460,847 | $ 477,326
Securities, Gross Unrealized Gains | 5,631 | 11,015
Securities, Gross Unrealized Losses | (3,594) | (386)
Securities available-for-sale | 462,884 | 487,955
Securities, Allowance for Investment Credit Losses |  |
Federal agency obligations [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 50,016 | 37,015
Securities, Gross Unrealized Gains | 1,032 | 1,508
Securities, Gross Unrealized Losses |  | (65)
Securities available-for-sale | 51,048 | 38,458
Securities, Allowance for Investment Credit Losses |  |
Residential mortgage pass-through securities [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 255,488 | 266,114
Securities, Gross Unrealized Gains | 2,640 | 4,811
Securities, Gross Unrealized Losses | (2,073) | (41)
Securities available-for-sale | 256,055 | 270,884
Securities, Allowance for Investment Credit Losses |  |
Commercial mortgage pass-through securities [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 10,859 | 6,906
Securities, Gross Unrealized Gains | 135 | 203
Securities, Gross Unrealized Losses | (468) | (187)
Securities available-for-sale | 10,526 | 6,922
Securities, Allowance for Investment Credit Losses |  |
Obligations of U.S. states and political subdivisions [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 129,632 | 138,539
Securities, Gross Unrealized Gains | 1,693 | 4,269
Securities, Gross Unrealized Losses | (1,051) |
Securities available-for-sale | 130,274 | 142,808
Securities, Allowance for Investment Credit Losses |  |
Corporate bonds and notes [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 10,965 | 24,925
Securities, Gross Unrealized Gains | 124 | 222
Securities, Gross Unrealized Losses |  | (52)
Securities available-for-sale | 11,089 | 25,095
Securities, Allowance for Investment Credit Losses |  |
Asset-backed securities [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 2,718 | 3,521
Securities, Gross Unrealized Gains | 6 |
Securities, Gross Unrealized Losses | (2) | (41)
Securities available-for-sale | 2,722 | 3,480
Securities, Allowance for Investment Credit Losses |  |
Certificates of deposit [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 149 | 149
Securities, Gross Unrealized Gains | 1 | 2
Securities, Gross Unrealized Losses |  |
Securities available-for-sale | 150 | 151
Securities, Allowance for Investment Credit Losses |  |
Other securities [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 1,020 | 157
Securities, Gross Unrealized Gains |  |
Securities, Gross Unrealized Losses |  |
Securities available-for-sale | 1,020 | $ 157
Securities, Allowance for Investment Credit Losses |  |

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