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Parent Company Financial Statements (Statements of Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend income from subsidiary |  |  |  |  |  |  |  |  | $ 655 | $ 722 | $ 1,315
Income before income tax expense | $ 22,842 | $ 20,969 | $ 13,692 | $ 16,893 | $ 19,159 | $ 18,184 | $ 16,479 | $ 17,757 | 74,396 | 71,579 | 65,777
Income tax benefit | (4,564) | (4,194) | (2,752) | (3,400) | (3,921) | (3,696) | (3,275) | (3,484) | (14,910) | (14,376) | (12,706)
Net income | $ 18,278 | $ 16,775 | $ 10,940 | $ 13,493 | $ 15,238 | $ 14,488 | $ 13,204 | $ 14,273 | 59,486 | 57,203 | 53,071
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend income from subsidiary |  |  |  |  |  |  |  |  | 39,400 | 36,900 | 28,100
Other income |  |  |  |  |  |  |  |  | 103 | 1,128 | 283
Total operating income |  |  |  |  |  |  |  |  | 39,503 | 38,028 | 28,383
Interest on borrowings |  |  |  |  |  |  |  |  | 3,512 | 3,267 | 3,415
Fees to Bank |  |  |  |  |  |  |  |  | 160 | 160 | 160
Other operating expenses |  |  |  |  |  |  |  |  | 578 | 641 | 569
Total operating expenses |  |  |  |  |  |  |  |  | 4,250 | 4,068 | 4,144
Income before equity in undistributed income of subsidiaries and income taxes |  |  |  |  |  |  |  |  | 35,253 | 33,960 | 24,239
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 23,299 | 22,580 | 27,971
Income before income tax expense |  |  |  |  |  |  |  |  | 58,552 | 56,540 | 52,210
Income tax benefit |  |  |  |  |  |  |  |  | 934 | 663 | 861
Net income |  |  |  |  |  |  |  |  | $ 59,486 | $ 57,203 | $ 53,071

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