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Condensed Parent Company Information (Condensed Statements of Cash Flows) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Activities:      
Net income $ 27,034 $ 24,996 $ 20,699
Decrease in other assets (3,904) 6,586 22,199
Increase (decrease) in other liabilities (222) 2,675 4,145
Net cash provided by operating activities 37,350 47,820 71,880
Investing Activities:      
Net cash provided (used) by investing activities (137,998) $ (25,803) $ 45,040
Financing Activities:      
Redemption of preferred stock (63,500)
Stock withheld for payment of taxes (54)
Net cash provided (used) by financing activities 114,832 $ 7,793 $ (135,153)
Net increase (decrease) in cash 14,184 29,810 (18,233)
Cash and Cash Equivalents, Beginning of Year 253,084 223,274 241,507
Cash and Cash Equivalents, End of Year 267,268 253,084 223,274
Parent Company [Member]      
Operating Activities:      
Net income 27,034 24,996 20,699
Excess of dividends over earnings of subsidiaries (Equity in undistributed earnings of subsidiaries 43,328 (18,343) $ (12,102)
Decrease in other assets 1 23
Increase (decrease) in other liabilities (272) 489 $ (217)
Net cash provided by operating activities 70,091 7,165 8,380
Financing Activities:      
Payment of preferred and common cash dividends (7,105) $ (7,171) $ (7,507)
Redemption of preferred stock (63,500)
Proceeds from issuance of common stock 112 $ 70
Stock withheld for payment of taxes (54)
Net cash provided (used) by financing activities (70,547) $ (7,101) $ (7,507)
Net increase (decrease) in cash (456) 64 873
Cash and Cash Equivalents, Beginning of Year 4,272 4,208 3,335
Cash and Cash Equivalents, End of Year $ 3,816 $ 4,272 $ 4,208