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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt securities, available for sale, amortized cost [Abstract] |  |
Due in one year or less | $ 65,507 |
Due after one through five years | 93,465 |
Due after five through ten years | 84,350 |
Due after ten years | 102,316 |
Amortized cost | 602,114 | $ 565,199
Debt securities, available for sale, fair value [Abstract] |  |
Due in one year or less | 65,393 |
Due after one through five years | 92,943 |
Due after five through ten years | 83,231 |
Due after ten years | 100,859 |
Fair value | 593,746 | 561,403
Debt securities, held to maturity, amortized cost [Abstract] |  |
Due in one year or less | 0 |
Due after one through five years | 649 |
Due after five through ten years | 0 |
Due after ten years | 0 |
Amortized cost | 649 | 659
Debt securities, held to maturity, fair value [Abstract] |  |
Due in one year or less | 0 |
Due after one through five years | 649 |
Due after five through ten years | 0 |
Due after ten years | 0 |
Fair value | 649 | 660
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Debt securities, available for sale, amortized cost [Abstract] |  |
Without single maturity date | 255,969 |
Amortized cost | 255,969 | 208,959
Debt securities, available for sale, fair value [Abstract] |  |
Without single maturity date | 250,819 |
Fair value | 250,819 | 205,309
Debt securities, held to maturity, amortized cost [Abstract] |  |
Without single maturity date | 0 |
Debt securities, held to maturity, fair value [Abstract] |  |
Without single maturity date | 0 |
Other Debt Obligations [Member] |  |
Debt securities, available for sale, amortized cost [Abstract] |  |
Without single maturity date | 507 |
Amortized cost | 507 | 507
Debt securities, available for sale, fair value [Abstract] |  |
Without single maturity date | 501 |
Fair value | 501 | $ 507
Debt securities, held to maturity, amortized cost [Abstract] |  |
Without single maturity date | 0 |
Debt securities, held to maturity, fair value [Abstract] |  |
Without single maturity date | $ 0 |

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