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Investment Securities - Schedule of unrealized loss on investments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 237,613 | $ 506,280
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,106 | 5,998
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 171,805 | 449,569
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,117 | 19,917
Debt Securities, Available-for-sale, Unrealized Loss Position | 409,418 | 955,849
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 6,223 | 25,915
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 124,616
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 1,933
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 77,654
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 1,742
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 202,270
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | 3,675
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 237,613 | 506,280
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,106 | 5,998
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 171,805 | 449,569
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,117 | 19,917
Debt Securities, Available-for-sale, Unrealized Loss Position | 409,418 | 955,849
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 6,223 | 25,915
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 32,656
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 838
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 6,931
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 165
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 39,587
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | 1,003
Obligations of States and Political Subdivisions |  |
Investment [Line Items] |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 91,960
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 1,095
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 70,723
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 1,577
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 162,683
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | $ 2,672

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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