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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