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Securities - Securities with gross unrealized losses (Details) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 months | $ 0 | $ 51,066,000
Unrealized Losses, Less than 12 months | 0 | (671,000)
Estimated Fair Value, 12 months or longer | 37,018,000 | 98,644,000
Unrealized Losses, 12 months or longer | (1,709,000) | (4,104,000)
Estimated Fair Value, Total | 37,018,000 | 149,710,000
Unrealized Losses, Total | $ (1,709,000) | $ (4,775,000)
Number of securities, Unrealized Losses, Less than 12 months | 0 | 52
Number of securities, Unrealized Losses, 12 months or longer | 31 | 75
Number of securities, Unrealized Losses, Total | 31 | 127
US Government-sponsored Enterprises Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 months | $ 0 | $ 0
Unrealized Losses, Less than 12 months | 0 | 0
Estimated Fair Value, 12 months or longer | 0 | 3,866,000
Unrealized Losses, 12 months or longer | 0 | (131,000)
Estimated Fair Value, Total | 0 | 3,866,000
Unrealized Losses, Total | 0 | (131,000)
Collateralized mortgage obligations and residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 months | 0 | 28,388,000
Unrealized Losses, Less than 12 months | 0 | (304,000)
Estimated Fair Value, 12 months or longer | 34,364,000 | 89,234,000
Unrealized Losses, 12 months or longer | (273,000) | (2,384,000)
Estimated Fair Value, Total | 34,364,000 | 117,622,000
Unrealized Losses, Total | (273,000) | (2,688,000)
Collateralized Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 months | 0 | 0
Unrealized Losses, Less than 12 months | 0 | 0
Estimated Fair Value, 12 months or longer | 2,047,000 | 2,049,000
Unrealized Losses, 12 months or longer | (1,408,000) | (1,432,000)
Estimated Fair Value, Total | 2,047,000 | 2,049,000
Unrealized Losses, Total | (1,408,000) | (1,432,000)
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 months | 0 | 22,678,000
Unrealized Losses, Less than 12 months | 0 | (367,000)
Estimated Fair Value, 12 months or longer | 607,000 | 3,495,000
Unrealized Losses, 12 months or longer | (28,000) | (157,000)
Estimated Fair Value, Total | 607,000 | 26,173,000
Unrealized Losses, Total | $ (28,000) | $ (524,000)

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