Investment Securities (Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities
Amortized Cost	$ 748,622	$ 632,967
Gross Unrealized Gains	17,491	12,693
Gross Unrealized Losses	(5,291)	(8,780)
Fair Value	760,822us-gaap_AvailableForSaleSecurities	636,880us-gaap_AvailableForSaleSecurities
U.S. Treasury and government agencies
Schedule of Available-for-sale Securities
Amortized Cost	0	1
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	0	1
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Amortized Cost	5,351	5,836
Gross Unrealized Gains	137	114
Gross Unrealized Losses	0	0
Fair Value	5,488	5,950
States and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost	114,775	62,292
Gross Unrealized Gains	3,734	2,510
Gross Unrealized Losses	(62)	(59)
Fair Value	118,447	64,743
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	592,904	529,245
Gross Unrealized Gains	8,965	5,910
Gross Unrealized Losses	(4,637)	(7,864)
Fair Value	597,232	527,291
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	27,907	28,021
Gross Unrealized Gains	353	112
Gross Unrealized Losses	(19)	(286)
Fair Value	28,241	27,847
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Amortized Cost	6,137	6,132
Gross Unrealized Gains	5	3
Gross Unrealized Losses	(493)	(490)
Fair Value	5,649	5,645
Equity securities
Schedule of Available-for-sale Securities
Amortized Cost	1,548	1,440
Gross Unrealized Gains	4,297	4,044
Gross Unrealized Losses	(80)	(81)
Fair Value	$ 5,765	$ 5,403

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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