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Investment Securities - Schedule of contractual maturity of debt securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Investment [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,007,834 | $ 1,187,499
Debt Securities, Available-for-sale | 1,059,341 | 1,209,701
Obligations of States and Political Subdivisions |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 66,449 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | $ 72,860 |
Debt Securities, Available-for-sale, Maturity, after Five Through Ten Years, Weighted Average Yield | 3.80% |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | $ 212,796 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | $ 232,358 |
Debt Securities, Available-for-sale, Maturity, after 10 Years, Weighted Average Yield | 3.67% |
Debt Securities, Available-for-sale, Amortized Cost | $ 279,245 | 302,928
Debt Securities, Available-for-sale | $ 305,218 | 320,491
Available for Sale Securities Weighted Avg Yield | 3.70% |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 726,589 | 884,571
Debt Securities, Available-for-sale | $ 752,109 | $ 889,210
Available for Sale Securities Weighted Avg Yield | 2.14% |
Corporate Debt Securities |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | $ 2,000 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | $ 2,014 |
Debt Securities, Available-for-sale, Maturity, after Five Through Ten Years, Weighted Average Yield | 4.00% |
Debt Securities, Available-for-sale, Amortized Cost | $ 2,000 |
Debt Securities, Available-for-sale | $ 2,014 |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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