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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