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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale, amortized cost [Abstract] |  |
Due in one year or less | $ 34,370 |
Due after one through five years | 88,607 |
Due after five through ten years | 94,121 |
Due after ten years | 77,871 |
Amortized cost | 643,164 | $ 602,114
Available for sale, fair value [Abstract] |  |
Due in one year or less | 34,394 |
Due after one through five years | 89,169 |
Due after five through ten years | 94,255 |
Due after ten years | 80,251 |
Fair value | 649,976 | 593,746
Held-to-maturity, amortized cost [Abstract] |  |
Due in one year or less | 517 |
Due after one through five years | 0 |
Due after five through ten years | 0 |
Due after ten years | 0 |
Amortized cost | 517 | 649
Held-to-maturity, fair value [Abstract] |  |
Due in one year or less | 517 |
Due after one through five years | 0 |
Due after five through ten years | 0 |
Due after ten years | 0 |
Fair value | 517 | 649
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Without single maturity date | 316,745 |
Amortized cost | 316,745 | 255,969
Available for sale, fair value [Abstract] |  |
Without single maturity date | 320,463 |
Fair value | 320,463 | 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 | 31,450 |
Amortized cost | 31,450 | 507
Available for sale, fair value [Abstract] |  |
Without single maturity date | 31,444 |
Fair value | 31,444 | $ 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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