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Parent Company Financial Statements, Condensed Statements of Income and Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Expenses [Abstract]      
Interest expense $ 18,294 $ 13,555 $ 11,773
Other expenses 11,901 12,077 11,780
Income before income taxes and equity in undistributed income of subsidiaries 68,511 66,464 64,963
Income tax benefit 17,018 19,118 18,531
Net income 51,493 47,346 46,432
Unrealized holding losses on securities available-for-sale [Abstract]      
Unrealized holding losses arising during the period (820) (4,578) (342)
Less: Reclassification adjustments for realized gains (losses) included in net income 73 522 (106)
Implementation of ASU 2018-02 (621) 0 0
Other comprehensive loss, net of tax (1,202) (3,315) (153)
Comprehensive income 50,291 44,031 46,279
Parent Company [Member]      
Income [Abstract]      
Dividends from subsidiary banks 24,661 20,708 19,808
Other income 904 459 414
Total income 25,565 21,167 20,222
Expenses [Abstract]      
Interest expense 1,723 1,417 1,170
Depreciation expense 116 107 130
Other expenses 2,858 2,256 2,465
Total expenses 4,697 3,780 3,765
Income before income taxes and equity in undistributed income of subsidiaries 20,868 17,387 16,457
Income tax benefit (1,445) (1,373) (1,371)
Income before equity in undistributed income of subsidiaries 22,313 18,760 17,828
Equity in undistributed income of subsidiaries 29,180 28,586 28,604
Net income 51,493 47,346 46,432
Unrealized holding losses on securities available-for-sale [Abstract]      
Unrealized holding losses arising during the period (820) (4,578) (342)
Less: Reclassification adjustments for realized gains (losses) included in net income 73 522 (106)
Tax benefit (312) (1,785) (83)
Implementation of ASU 2018-02 (621) 0 0
Other comprehensive loss, net of tax (1,202) (3,315) (153)
Comprehensive income $ 50,291 $ 44,031 $ 46,279