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Condensed Parent Company Information (Condensed Statements of Cash Flows) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Activities:      
Net income $ 27,509 $ 27,034 $ 24,996
Decrease in other assets (724) (5,062) 2,164
Increase (decrease) in other liabilities 2,868 (222) 2,675
Net cash provided by operating activities 47,467 37,350 47,820
Investing Activities:      
Net cash used by investing activities (246,308) (137,998) (25,803)
Financing Activities:      
Redemption of preferred stock (63,500)
Stock withheld for payment of taxes (166) (54)
Net cash provided by financing activities 237,566 114,832 7,793
Net increase (decrease) in cash 38,725 14,184 29,810
Cash and Cash Equivalents, Beginning of Year 267,268 253,084 223,274
Cash and Cash Equivalents, End of Year 305,993 267,268 253,084
Parent Company [Member]      
Operating Activities:      
Net income 27,509 27,034 24,996
Excess of dividends over earnings of subsidiaries (Equity in undistributed earnings of subsidiaries) (20,517) 43,328 (18,343)
Decrease in other assets 15 1 23
Increase (decrease) in other liabilities 130 (272) 489
Net cash provided by operating activities 7,137 70,091 7,165
Financing Activities:      
Payment of preferred and common cash dividends (6,632) (7,105) (7,171)
Redemption of preferred stock (63,500)
Proceeds from issuance of common stock 375 112 70
Stock withheld for payment of taxes (166) (54)
Net cash provided by financing activities (6,423) (70,547) (7,101)
Net increase (decrease) in cash 714 (456) 64
Cash and Cash Equivalents, Beginning of Year 3,816 4,272 4,208
Cash and Cash Equivalents, End of Year $ 4,530 $ 3,816 $ 4,272