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Parent Company Financial Statements, Condensed Statements of Income and Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Expenses [Abstract]      
Interest expense $ 40,513 $ 29,295 $ 18,294
Other expenses 12,539 15,558 11,901
Income before income taxes and equity in undistributed income of subsidiaries 71,992 70,542 68,511
Income tax benefit 7,452 11,314 17,018
Net income 64,540 59,228 51,493
Unrealized holding gains (losses) on securities available-for-sale [Abstract]      
Unrealized holding gains (losses) arising during the period 14,270 (5,393) (820)
Less: Reclassification adjustments for realized gains (losses) included in net income 3 (821) 73
Other comprehensive income (loss), net of tax 10,864 (3,612) (581)
Comprehensive income 75,404 55,616 50,912
Parent Company [Member]      
Income [Abstract]      
Dividends from subsidiary banks 30,152 26,750 24,661
Other income 757 489 904
Total income 30,909 27,239 25,565
Expenses [Abstract]      
Interest expense 2,520 2,318 1,723
Depreciation expense 144 135 116
Other expenses 3,273 3,156 2,858
Total expenses 5,937 5,609 4,697
Income before income taxes and equity in undistributed income of subsidiaries 24,972 21,630 20,868
Income tax benefit (4,947) (1,219) (1,445)
Income before equity in undistributed income of subsidiaries 29,919 22,849 22,313
Equity in undistributed income of subsidiaries 34,621 36,379 29,180
Net income 64,540 59,228 51,493
Unrealized holding gains (losses) on securities available-for-sale [Abstract]      
Unrealized holding gains (losses) arising during the period 14,270 (5,393) (820)
Less: Reclassification adjustments for realized gains (losses) included in net income 3 (821) 73
Tax expense (benefit) 3,403 (960) (312)
Other comprehensive income (loss), net of tax 10,864 (3,612) (581)
Comprehensive income $ 75,404 $ 55,616 $ 50,912