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Company Only Condensed Financial Information - Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |
Interest income | $ 13,103 | $ 12,965 | $ 12,981 | $ 13,021 | $ 13,305 | $ 12,506 | $ 12,193 | $ 12,086 | $ 52,070 | $ 50,090
Other expense | (11,155) | (9,425) | (10,215) | (9,959) | (9,318) | (10,200) | (9,607) | (11,266) | (40,754) | (40,391)
Income (loss) before income taxes | 10,219 | 5,133 | 5,837 | 4,859 | 5,693 | 4,154 | 4,144 | 2,203 | 26,048 | 16,194
Income tax expense | $ 2,803 | $ 1,396 | $ 1,207 | $ 1,300 | $ 4,702 | $ 594 | $ 1,572 | $ 322 | 6,706 | 7,190
Parent Company [Member] |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 0 | 110
Dividends from subsidiary |  |  |  |  |  |  |  |  | 36,044 | 10,629
Other expense |  |  |  |  |  |  |  |  | (1,573) | (1,693)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 34,471 | 9,046
Income tax expense |  |  |  |  |  |  |  |  | (398) | 290
Loss before equity in undistributed subsidiary income |  |  |  |  |  |  |  |  | 34,869 | 8,756
Equity in undistributed subsidiary excess distributions |  |  |  |  |  |  |  |  | (15,527) | 248
Net income (loss) |  |  |  |  |  |  |  |  | $ 19,342 | $ 9,004

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