Investment Securities (Summary of Amortized Cost and Fair Value of Available-for-Sale Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale, Amortized Cost	$ 688,385	$ 580,234
Investment securities available-for-sale, Unrealized Gains	3,587	7,518
Investment securities available-for-sale, Unrealized Losses	7,402	943
Available-for-sale, at fair value	684,570	586,809
Government sponsored agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale, Amortized Cost	93,895	97,529
Investment securities available-for-sale, Unrealized Gains	250	241
Investment securities available-for-sale, Unrealized Losses	382	213
Available-for-sale, at fair value	93,763	97,557
State and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale, Amortized Cost	42,450	47,663
Investment securities available-for-sale, Unrealized Gains	1,355	2,302
Investment securities available-for-sale, Unrealized Losses	7	0
Available-for-sale, at fair value	43,798	49,965
Residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale, Amortized Cost	303,495	96,320
Investment securities available-for-sale, Unrealized Gains	968	3,100
Investment securities available-for-sale, Unrealized Losses	5,097	9
Available-for-sale, at fair value	299,366	99,411
Collateralized mortgage obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale, Amortized Cost	182,128	262,790
Investment securities available-for-sale, Unrealized Gains	452	984
Investment securities available-for-sale, Unrealized Losses	1,639	182
Available-for-sale, at fair value	180,941	263,592
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale, Amortized Cost	65,028	69,788
Investment securities available-for-sale, Unrealized Gains	499	546
Investment securities available-for-sale, Unrealized Losses	252	539
Available-for-sale, at fair value	65,275	69,795
Preferred stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale, Amortized Cost	1,389	6,144
Investment securities available-for-sale, Unrealized Gains	63	345
Investment securities available-for-sale, Unrealized Losses	25	0
Available-for-sale, at fair value	$ 1,427	$ 6,489