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Fair Value of Financial Instruments - Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Securities available for sale, fair value | $ 715,412 | $ 772,500
Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale, fair value | 489,556 | 523,849
Other Securities [Member] |  |
Securities available for sale, fair value | 1,355 | 1,332
Fair Value, Measurements, Recurring [Member] |  |
Total assets | 715,412 | 774,852
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 115,737 | 64,037
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale, fair value | 489,556 | 523,849
Fair Value, Measurements, Recurring [Member] | Other Securities [Member] |  |
Securities available for sale, fair value | 225,856 | 248,651
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 0 | 2,352
Interest Rate Swaps, Net Amount | 70,611 | 19,653
Fair Value, Measurements, Recurring [Member] | Junior Subordinated Debentures [Member] |  |
Borrowings | 45,126 | 44,384
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total assets | 12,476 | 12,216
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 | 12,476 | 12,216
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 | 701,581 | 761,304
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 70,611 | 19,653
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale, fair value | 489,556 | 523,849
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Securities [Member] |  |
Securities available for sale, fair value | 212,025 | 235,103
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 0 | 2,352
Interest Rate Swaps, Net Amount | 70,611 | 19,653
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 | 1,355 | 1,332
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 45,126 | 44,384
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 | 1,355 | 1,332
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 | $ 45,126 | $ 44,384

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