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Investment Securities - Narrative (Details) $ in Thousands | Mar. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($)
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Investments, Debt and Equity Securities [Abstract] |  |
Carrying value of securities pledged as collateral | $ 506,562 | $ 416,155
Book value of securities sold under agreements to repurchase | 112,029 | 116,691
Schedule of Available for sale Securities and Held to maturity Securities [Line Items] |  |
Gross Unrealized Losses | 3,672 | 14,253
Held-to-maturity unrealized losses | 1,704 | $ 4,741
State and municipal |  |
Schedule of Available for sale Securities and Held to maturity Securities [Line Items] |  |
Gross Unrealized Losses | $ 532 |
Number of securities in unrealized loss positions | security | 33 |
Held-to-maturity unrealized losses | $ 117 |
Held-to-maturity, number of securities in unrealized loss positions | security | 22 |
U.S. Government-sponsored agency securities |  |
Schedule of Available for sale Securities and Held to maturity Securities [Line Items] |  |
Gross Unrealized Losses | $ 1 |
Number of securities in unrealized loss positions | security | 1 |
Held-to-maturity unrealized losses | $ 350 |
Held-to-maturity, number of securities in unrealized loss positions | security | 5 |
U.S. Government-sponsored mortgage-backed securities |  |
Schedule of Available for sale Securities and Held to maturity Securities [Line Items] |  |
Gross Unrealized Losses | $ 3,139 |
Number of securities in unrealized loss positions | security | 79 |
Held-to-maturity unrealized losses | $ 1,237 |
Held-to-maturity, number of securities in unrealized loss positions | security | 45 |

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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=26873400&loc=d3e23780-122690 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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