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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