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Company Only Condensed Financial Information - Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |
Interest income | $ 12,627 | $ 13,242 | $ 13,103 | $ 13,219 | $ 13,103 | $ 12,965 | $ 12,981 | $ 13,021 | $ 52,191 | $ 52,070
Other expense | (9,562) | (9,509) | (9,472) | (10,098) | (11,155) | (9,425) | (10,215) | (9,959) | (38,641) | (40,754)
Income (loss) before income taxes | 4,624 | 5,341 | 1,100 | 4,832 | 10,219 | 5,133 | 5,837 | 4,859 | 15,897 | 26,048
Income tax expense | $ 1,234 | $ 1,417 | $ 293 | $ 1,281 | $ 2,803 | $ 1,396 | $ 1,207 | $ 1,300 | 4,225 | 6,706
Parent Company [Member] |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends from subsidiary |  |  |  |  |  |  |  |  | 21,200 | 36,044
Other expense |  |  |  |  |  |  |  |  | (1,600) | (1,573)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 19,600 | 34,471
Income tax expense |  |  |  |  |  |  |  |  | (433) | (398)
Loss before equity in undistributed subsidiary income |  |  |  |  |  |  |  |  | 20,033 | 34,869
Equity in undistributed subsidiary excess distributions |  |  |  |  |  |  |  |  | (8,361) | (15,527)
Net income (loss) |  |  |  |  |  |  |  |  | $ 11,672 | $ 19,342

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