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Investment Securities - Narrative (Details) $ in Thousands | Jun. 30, 2020 USD ($) security | Dec. 31, 2019 USD ($)
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Investments, Debt and Equity Securities [Abstract] |  |
Carrying value of securities pledged as collateral | $ 1,100,278 | $ 503,427
Book value of securities sold under agreements to repurchase | 171,346 | 182,856
Schedule of Available for sale Securities and Held to maturity Securities [Line Items] |  |
Gross unrealized losses | 165 | 2,211
Held-to-maturity unrealized losses | 74 | 545
State and municipal |  |
Schedule of Available for sale Securities and Held to maturity Securities [Line Items] |  |
Gross unrealized losses | $ 138 | 807
Number of securities in unrealized loss positions | security | 13 |
Held-to-maturity unrealized losses | $ 43 | 107
Held-to-maturity, number of securities in unrealized loss positions | security | 2 |
U.S. Government-sponsored mortgage-backed securities |  |
Schedule of Available for sale Securities and Held to maturity Securities [Line Items] |  |
Gross unrealized losses | $ 27 | 1,404
Number of securities in unrealized loss positions | security | 1 |
Held-to-maturity unrealized losses | $ 31 | $ 401
Held-to-maturity, number of securities in unrealized loss positions | security | 3 |

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- Definition Carrying amount of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(i)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, 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 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455 + Details
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