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Fair Value of Financial Instruments - Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Securities available for sale, fair value | $ 761,221 | $ 647,974
Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale, fair value | 518,781 | 404,460
Other Securities [Member] |  |
Securities available for sale, fair value | 1,342 | 1,295
Fair Value, Measurements, Recurring [Member] |  |
Total assets | 770,587 | 649,293
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 83,806 | 104,123
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale, fair value | 518,781 | 404,460
Fair Value, Measurements, Recurring [Member] | Other Securities [Member] |  |
Securities available for sale, fair value | 242,440 | 243,514
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 9,366 | 1,319
Interest Rate Swaps, Net Amount | 39,094 | 60,987
Fair Value, Measurements, Recurring [Member] | Junior Subordinated Debentures [Member] |  |
Borrowings | 44,712 | 43,136
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total assets | 12,525 | 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 | 12,525 | 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 | 756,720 | 635,295
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 39,094 | 60,987
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale, fair value | 518,781 | 404,460
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Securities [Member] |  |
Securities available for sale, fair value | 228,573 | 229,516
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 9,366 | 1,319
Interest Rate Swaps, Net Amount | 39,094 | 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 | 1,342 | 1,295
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 44,712 | 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 | 1,342 | 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 | 44,712 | 43,136
Fair Value, Measurements, Nonrecurring [Member] |  |
Total assets | 11,388 | 11,980
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 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 | $ 11,388 | $ 11,980

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