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Fair Value of Financial Instruments - Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
--- | --- | --- | ---
Securities available for sale, fair value | $ 821,445 | $ 647,974 |
us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount | 0 |  | $ 0
Collateralized Mortgage Backed Securities [Member] |  |  |
Securities available for sale, fair value | 596,661 | 404,460 |
Other Securities [Member] |  |  |
Securities available for sale, fair value | 1,495 | 1,295 |
Fair Value, Measurements, Recurring [Member] |  |  |
Total assets | 828,443 | 649,293 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 92,334 | 104,123 |
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] |  |  |
Securities available for sale, fair value | 596,661 | 404,460 |
Fair Value, Measurements, Recurring [Member] | Other Securities [Member] |  |  |
Securities available for sale, fair value | 224,784 | 243,514 |
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] |  |  |
Interest Rate Swaps, Net Amount | 6,998 | 1,319 |
Interest Rate Swaps, Net Amount | 42,520 | 60,987 |
Fair Value, Measurements, Recurring [Member] | Junior Subordinated Debentures [Member] |  |  |
Borrowings | 49,814 | 43,136 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Total assets | 12,585 | 12,703 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Backed Securities [Member] |  |  |
Securities available for sale, fair value | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Securities [Member] |  |  |
Securities available for sale, fair value | 12,585 | 12,703 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member] |  |  |
Interest Rate Swaps, Net Amount | 0 | 0 |
Interest Rate Swaps, Net Amount | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Junior Subordinated Debentures [Member] |  |  |
Borrowings | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Total assets | 814,363 | 635,295 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 42,520 | 60,987 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] |  |  |
Securities available for sale, fair value | 596,661 | 404,460 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Securities [Member] |  |  |
Securities available for sale, fair value | 210,704 | 229,516 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |  |
Interest Rate Swaps, Net Amount | 6,998 | 1,319 |
Interest Rate Swaps, Net Amount | 42,520 | 60,987 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Junior Subordinated Debentures [Member] |  |  |
Borrowings | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Total assets | 1,495 | 1,295 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 49,814 | 43,136 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Backed Securities [Member] |  |  |
Securities available for sale, fair value | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Securities [Member] |  |  |
Securities available for sale, fair value | 1,495 | 1,295 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] |  |  |
Interest Rate Swaps, Net Amount | 0 | 0 |
Interest Rate Swaps, Net Amount | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Junior Subordinated Debentures [Member] |  |  |
Borrowings | 49,814 | 43,136 |
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Total assets | 10,105 | 11,980 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Total assets | 0 | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Total assets | 0 | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Total assets | $ 10,105 | $ 11,980 |

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