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Condensed Parent Company Information (Condensed Statements of Cash Flows) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Activities:      
Net income $ 45,972 $ 27,509 $ 27,034
Decrease in other assets 6,724 (724) (5,062)
Increase (decrease) in other liabilities (10,729) 2,868 (222)
Net cash provided by operating activities 26,838 41,271 37,350
Investing Activities:      
Net cash paid in acquisitions 72,519 (53,640)
Net cash used by investing activities (128,532) (240,112) (137,998)
Financing Activities:      
Redemption of preferred stock (63,500)
Stock withheld for payment of taxes (231) (166) (54)
Net cash provided by financing activities 285,191 237,566 114,832
Net increase (decrease) in cash 183,497 38,725 14,184
Cash and Cash Equivalents, Beginning of Year 305,993 267,268 253,084
Cash and Cash Equivalents, End of Year 489,490 305,993 267,268
Parent Company [Member]      
Operating Activities:      
Net income 45,972 27,509 27,034
Excess of dividends over earnings of subsidiaries (Equity in undistributed earnings of subsidiaries) 4,793 (20,517) 43,328
Decrease in other assets 283 15 1
Increase (decrease) in other liabilities (67) 130 (272)
Net cash provided by operating activities 50,981 7,137 70,091
Investing Activities:      
Downstream cash investment to subsidiary (9,000)
Note receivable proceeds received 3,054
Proceeds from sales of investments 174
Net cash paid in acquisitions (37,664)
Net cash used by investing activities (43,436)
Financing Activities:      
Payment of preferred and common cash dividends (7,596) (6,632) (7,105)
Redemption of preferred stock (63,500)
Proceeds from issuance of common stock 287 375 112
Stock withheld for payment of taxes (231) (166) (54)
Net cash provided by financing activities (7,540) (6,423) (70,547)
Net increase (decrease) in cash 5 714 (456)
Cash and Cash Equivalents, Beginning of Year 4,530 3,816 4,272
Cash and Cash Equivalents, End of Year $ 4,535 $ 4,530 $ 3,816