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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale, amortized cost [Abstract] |  |
Due in one year or less | $ 29,546 |
Due after one through five years | 93,079 |
Due after five through ten years | 80,646 |
Due after ten years | 98,109 |
Amortized cost | 601,544 | $ 602,114
Available for sale, fair value [Abstract] |  |
Due in one year or less | 29,499 |
Due after one through five years | 93,111 |
Due after five through ten years | 80,248 |
Due after ten years | 98,348 |
Fair value | 599,299 | 593,746
Held-to-maturity, amortized cost [Abstract] |  |
Due in one year or less | 619 |
Due after one through five years | 0 |
Due after five through ten years | 0 |
Due after ten years | 0 |
Amortized cost | 619 | 649
Held-to-maturity, fair value [Abstract] |  |
Due in one year or less | 619 |
Due after one through five years | 0 |
Due after five through ten years | 0 |
Due after ten years | 0 |
Fair value | 619 | 649
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Without single maturity date | 299,658 |
Amortized cost | 299,658 | 255,969
Available for sale, fair value [Abstract] |  |
Without single maturity date | 297,591 |
Fair value | 297,591 | 250,819
Held-to-maturity, amortized cost [Abstract] |  |
Without single maturity date | 0 |
Held-to-maturity, fair value [Abstract] |  |
Without single maturity date | 0 |
Other Debt Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Without single maturity date | 506 |
Amortized cost | 506 | 507
Available for sale, fair value [Abstract] |  |
Without single maturity date | 502 |
Fair value | 502 | $ 501
Held-to-maturity, amortized cost [Abstract] |  |
Without single maturity date | 0 |
Held-to-maturity, fair value [Abstract] |  |
Without single maturity date | $ 0 |

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