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Investment Securities (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investment [Line Items] |  |  |
Other than Temporary Impairment Losses, Investments | $ 0 | $ 0 | $ 0
Asset-backed securities mortgage portfolio, maturity term | 15 years |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,187,499,000 | 1,028,883,000 |
Debt Securities, Held-to-maturity, Transfer, Amount | 373,900,000 | 0 | 0
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax | 19,095,000 | 0 | 0
Pledged Financial Instruments, Not Separately Reported, Securities | 370,000,000 | 332,000,000 |
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements | 197,000,000 | 280,000,000 |
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank | 18,000,000 | 22,000,000 |
Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity [Table Text Block] | $ 0 |  |
Percentage of amount greater than shareholder's equity | 10.00% |  |
Debt Securities, Available-for-sale, Realized Loss | $ 692,000 | 2,600,000 |
Debt Securities, Available-for-sale, Realized Gain | 271,000 | 60,000 |
Debt Securities, Held-to-maturity | 0 | 351,808,000 |
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss) |  | $ 300,000 |
percent of held to securities sold paid down |  | 96.30% |
Debt Securities sold at a loss [Domain] |  |  |
Investment [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | $ 245,000,000.0 |
Available-for-sale Securities, Amortized Cost Basis | 62,400,000 |  |
Securities sold at a gain [Member] |  |  |
Investment [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 2,000,000.0 |
Available-for-sale Securities, Amortized Cost Basis | 29,100,000 |  |
Debt Securities, Held-to-maturity |  | $ 7,400,000 |
Available-for-sale Securities, Equity Securities |  |  | 444,000
Debt and Equity Securities, Realized Gain (Loss) |  |  | $ 1,800,000
Residential mortgage-backed securities |  |  |
Investment [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 581,000,000.0 |  |
Collateralized mortgage-backed securities |  |  |
Investment [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 303,600,000 |  |

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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=118939692&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=118942338&loc=SL82898722-210454 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562 + Details
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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for FHLB debt obligations, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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