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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

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