Condensed Parent Company Information (Condensed Statements of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities:
Net income (loss)	$ 24,996us-gaap_NetIncomeLoss	$ 20,699us-gaap_NetIncomeLoss	$ (23,406)us-gaap_NetIncomeLoss
Decrease in other assets	6,586	22,199	(19,274)
Increase (decrease) in other liabilities	2,675	4,145	(2,940)
Net cash provided by operating activities	47,820	71,880	41,681
Investing Activities:
Net cash provided (used) by investing activities	(25,803)	45,040	5,722
Financing Activities:
Proceeds from issuance of preferred stock			7,287
Proceeds from issuance of common stock	70		26,727
Repurchases of common stock			(2)
Net cash provided (used) by financing activities	7,793	(135,153)	(22,063)
Net increase in cash	29,810	(18,233)	25,340
Cash and Cash Equivalents, Beginning of Year	223,274	241,507	216,167
Cash and Cash Equivalents, End of Year	253,084	223,274	241,507
Parent Company [Member]
Operating Activities:
Net income (loss)	24,996	20,699	(23,406)
Equity in undistributed (earnings) losses of subsidiaries	(18,343)	(12,102)	21,493
Dividend from subsidiaries in excess of earnings			10,000
Decrease in other assets	23		26
Increase (decrease) in other liabilities	489	(217)	199
Net cash provided by operating activities	7,165	8,380	8,312
Investing Activities:
Downstream cash investment in subsidiary			(33,850)
Net cash provided (used) by investing activities			(33,850)
Financing Activities:
Payment of preferred and common cash dividends	(7,171)	(7,507)	(8,463)
Proceeds from issuance of preferred stock			7,287
Proceeds from issuance of common stock	70		26,727
Repurchases of common stock			(2)
Net cash provided (used) by financing activities	(7,101)	(7,507)	25,549
Net increase in cash	64	873	11
Cash and Cash Equivalents, Beginning of Year	4,208	3,335	3,324
Cash and Cash Equivalents, End of Year	$ 4,272	$ 4,208	$ 3,335

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