Condensed Financial Information (parent company only) - Statement of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Net Income	$ 44,530	$ 45,122	$ 25,252
Adjustments to Reconcile Net Income to Net Cash:
Share-based Compensation	1,773	1,492	1,315
Net Change in:
Net cash provided by operating activities	183,131	70,269	85,484
Cash Flows from Investing Activities:
Other	(2,768)	(2,065)	8,287
Net cash provided by (used in) investing activities	(138,162)	11,886	(28,163)
Cash Flows from Financing Activities:
Repayment of Borrowings	(163,838)	(271,005)	(252,509)
Preferred stock redemption under Capital Purchase Program			(69,600)
Preferred stock issued under Small Business Lending Fund			90,783
Preferred stock redemption under Small Business Lending Fund	(90,783)
Repurchase of Common Stock Warrants under Capital Purchase Program			(368)
Common Stock Issued			21,165
Stock Issued Under Employee Benefit Plans	479	449	669
Stock Issued Under Dividend Reinvestment and Stock Purchase Plan	325	202	89
Stock Options Exercised	115	78
Stock redeemed	(491)	(235)	(126)
Net cash used in financing activities	(36,995)	(54,007)	(42,316)
Net Change in Cash and Cash Equivalents	7,974	28,148	15,005
Cash and Cash Equivalents, January 1	101,460	73,312	58,307
Cash and Cash Equivalents, December 31	109,434	101,460	73,312
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net Income	44,530	45,122	25,252
Adjustments to Reconcile Net Income to Net Cash:
Share-based Compensation	778	632	524
Distributions in Excess of (Equity in Undistributed) Income of Subsidiaries	12,668	(21,319)	(29,234)
Net Change in:
Other Assets	(1,354)	1,902	5,747
Other Liabilities	(8,438)	1,122	1,091
Investment in Subsidiaries - Operating Activities	12,991	(1,755)	(6,593)
Net cash provided by operating activities	61,175	25,704	(3,213)
Cash Flows from Investing Activities:
Investing Activities:		(126)	704
Other	240
Net cash provided by (used in) investing activities	240	(126)	704
Cash Flows from Financing Activities:
Cash Dividends	(7,992)	(7,442)	(4,729)
Repayment of Borrowings	(55,000)	(4,124)	(46,400)
Proceeds from issuance of long-term debt	70,000
Preferred stock redemption under Capital Purchase Program			(69,600)
Preferred stock issued under Small Business Lending Fund			90,783
Preferred stock redemption under Small Business Lending Fund	(90,783)
Repurchase of Common Stock Warrants under Capital Purchase Program			(368)
Common Stock Issued			21,165
Stock Issued Under Employee Benefit Plans	479	449	669
Stock Issued Under Dividend Reinvestment and Stock Purchase Plan	325	202	89
Stock Options Exercised	115	78
Stock redeemed	(491)	(235)	(126)
Other			298
Net cash used in financing activities	(83,347)	(11,072)	(8,219)
Net Change in Cash and Cash Equivalents	(21,932)	14,506	(10,728)
Cash and Cash Equivalents, January 1	35,160	20,654	31,382
Cash and Cash Equivalents, December 31	$ 13,228	$ 35,160	$ 20,654