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Fair Value of Financial Instruments - Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Securities available for sale, fair value | $ 796,799 | $ 647,974 |
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0 |  | $ 0
Collateralized Mortgage Backed Securities [Member] |  |  |
Securities available for sale, fair value | 584,145 | 404,460 |
Other Securities [Member] |  |  |
Securities available for sale, fair value | 1,548 | 1,295 |
Fair Value, Measurements, Recurring [Member] |  |  |
Total assets | 804,192 | 649,293 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 84,774 | 104,123 |
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] |  |  |
Securities available for sale, fair value | 584,145 | 404,460 |
Fair Value, Measurements, Recurring [Member] | Other Securities [Member] |  |  |
Securities available for sale, fair value | 212,654 | 243,514 |
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] |  |  |
Interest Rate Swaps, Net Amount | 7,393 | 1,319 |
Interest Rate Swaps, Net Amount | 33,196 | 60,987 |
Fair Value, Measurements, Recurring [Member] | Junior Subordinated Debentures [Member] |  |  |
Borrowings | 51,578 | 43,136 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Total assets | 12,572 | 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 | 12,572 | 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 | 790,072 | 635,295 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 33,196 | 60,987 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] |  |  |
Securities available for sale, fair value | 584,145 | 404,460 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Securities [Member] |  |  |
Securities available for sale, fair value | 198,534 | 229,516 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |  |
Interest Rate Swaps, Net Amount | 7,393 | 1,319 |
Interest Rate Swaps, Net Amount | 33,196 | 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 | 1,548 | 1,295 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 51,578 | 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 | 1,548 | 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 | 51,578 | 43,136 |
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Total assets | 11,614 | 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 | $ 11,614 | $ 11,980 |

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