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Parent Company Financial Statements (Statements of Income) (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 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend income from subsidiary |  |  |  |  |  |  |  |  | $ 722 | $ 1,315 | $ 1,135
Interest on borrowings |  |  |  |  |  |  |  |  | 3,621 | 7,456 | 5,585
Income before income tax expense | $ 19,159 | $ 18,184 | $ 16,479 | $ 17,757 | $ 17,479 | $ 17,295 | $ 15,104 | $ 15,899 | 71,579 | 65,777 | 62,354
Income tax benefit (expense) | (3,921) | (3,696) | (3,275) | (3,484) | (3,502) | (3,238) | (2,887) | (3,079) | (14,376) | (12,706) | (33,878)
Net income | $ 15,238 | $ 14,488 | $ 13,204 | $ 14,273 | $ 13,977 | $ 14,057 | $ 12,217 | $ 12,820 | 57,203 | 53,071 | 28,476
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend income from subsidiary |  |  |  |  |  |  |  |  | 36,900 | 28,100 | 16,800
Other income |  |  |  |  |  |  |  |  | 1,128 | 283 | 145
Total operating income |  |  |  |  |  |  |  |  | 38,028 | 28,383 | 16,945
Interest on borrowings |  |  |  |  |  |  |  |  | 3,267 | 3,415 | 3,408
Fees to Bank |  |  |  |  |  |  |  |  | 160 | 160 | 160
Other operating expenses |  |  |  |  |  |  |  |  | 641 | 569 | 592
Total operating expenses |  |  |  |  |  |  |  |  | 4,068 | 4,144 | 4,160
Income before equity in undistributed income of subsidiaries and income taxes |  |  |  |  |  |  |  |  | 33,960 | 24,239 | 12,785
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 22,580 | 27,971 | 17,405
Income before income tax expense |  |  |  |  |  |  |  |  | 56,540 | 52,210 | 30,190
Income tax benefit (expense) |  |  |  |  |  |  |  |  | 663 | 861 | (1,714)
Net income |  |  |  |  |  |  |  |  | $ 57,203 | $ 53,071 | $ 28,476

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