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Parent Company Financial Statements, Condensed Statements of Income and Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Expenses [Abstract] |  |  |
Interest expense | $ 29,295 | $ 18,294 | $ 13,555
Other expenses | 15,558 | 11,901 | 12,077
Income before income taxes and equity in undistributed income of subsidiaries | 70,542 | 68,511 | 66,464
Income tax benefit | 11,314 | 17,018 | 19,118
Net income | 59,228 | 51,493 | 47,346
Unrealized holding losses on securities available-for-sale [Abstract] |  |  |
Unrealized holding losses arising during the period | (5,393) | (820) | (4,578)
Less: Reclassification adjustments for realized gains included in net income | (821) | 73 | 522
Other comprehensive loss, net of tax | (3,612) | (581) | (3,315)
Comprehensive income | 55,616 | 50,912 | 44,031
Parent Company [Member] |  |  |
Income [Abstract] |  |  |
Dividends from subsidiary banks | 26,750 | 24,661 | 20,708
Other income | 489 | 904 | 459
Total income | 27,239 | 25,565 | 21,167
Expenses [Abstract] |  |  |
Interest expense | 2,318 | 1,723 | 1,417
Depreciation expense | 135 | 116 | 107
Other expenses | 3,156 | 2,858 | 2,256
Total expenses | 5,609 | 4,697 | 3,780
Income before income taxes and equity in undistributed income of subsidiaries | 21,630 | 20,868 | 17,387
Income tax benefit | (1,219) | (1,445) | (1,373)
Income before equity in undistributed income of subsidiaries | 22,849 | 22,313 | 18,760
Equity in undistributed income of subsidiaries | 36,379 | 29,180 | 28,586
Net income | 59,228 | 51,493 | 47,346
Unrealized holding losses on securities available-for-sale [Abstract] |  |  |
Unrealized holding losses arising during the period | (5,393) | (820) | (4,578)
Less: Reclassification adjustments for realized gains included in net income | (821) | 73 | 522
Tax benefit | (960) | (312) | (1,785)
Other comprehensive loss, net of tax | (3,612) | (581) | (3,315)
Comprehensive income | $ 55,616 | $ 50,912 | $ 44,031

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