Investment Securities (Available-for-sale Securities by Maturities) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2013	Dec. 31, 2012
Investments [Abstract]
Federal income tax rate	35.00%
Schedule of Available-for-sale Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	$ 467
Debt securities, maturing 1 to 5 years, amortized cost	10,998
Debt securities, maturing 5 to 10 years, amortized cost	87,020
Available-for-sale securities, maturing over 10 years, amortized cost	506,743
Available-for-sale securities, total amortized cost	606,441	628,584
Debt securities, maturing within 1 year, fair value	471
Debt securities, maturing 1 to 5 years, fair value	11,484
Debt securities, maturing 5 to 10 years, fair value	86,275
Available-for-sale securities, maturing over 10 years, fair value	497,763
Available-for-sale securities, total fair value	600,328	639,185
Available-for-sale securities, maturing within 1 year, average yield	4.73%
Available-for-sale securities, maturing 1 to 5 years, average yield	4.05%
Available-for-sale securities, maturing 5 to 10 years, average yield	3.01%
Available-for-sale securities, maturing over 10 years, average yield	2.70%
Available-for-sale securities, total average yield	2.79%
U.S. Treasury and government agencies
Schedule of Available-for-sale Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	20
Debt securities, maturing 5 to 10 years, amortized cost	3
Debt securities, maturing over 10 years, amortized cost	0
Debt securities, total amortized cost	23
Available-for-sale securities, total amortized cost	23	26
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	20
Debt securities, maturing 5 to 10 years, fair value	3
Debt securities, maturing over 10 years, fair value	0
Debt securities, total fair value	23
Available-for-sale securities, total fair value	23	26
U.S. government sponsored agencies
Schedule of Available-for-sale Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	382
Debt securities, maturing 5 to 10 years, amortized cost	0
Debt securities, maturing over 10 years, amortized cost	0
Debt securities, total amortized cost	382
Available-for-sale securities, total amortized cost	382	486
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	400
Debt securities, maturing 5 to 10 years, fair value	0
Debt securities, maturing over 10 years, fair value	0
Debt securities, total fair value	400
Available-for-sale securities, total fair value	400	516
States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	467
Debt securities, maturing 1 to 5 years, amortized cost	1,718
Debt securities, maturing 5 to 10 years, amortized cost	17,346
Debt securities, maturing over 10 years, amortized cost	30,254
Debt securities, total amortized cost	49,785
Available-for-sale securities, total amortized cost	49,785	42,458
Debt securities, maturing within 1 year, fair value	471
Debt securities, maturing 1 to 5 years, fair value	1,828
Debt securities, maturing 5 to 10 years, fair value	18,183
Debt securities, maturing over 10 years, fair value	30,097
Debt securities, total fair value	50,579
Available-for-sale securities, total fair value	50,579	45,668
Residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	3,573
Debt securities, maturing 5 to 10 years, amortized cost	46,468
Debt securities, maturing over 10 years, amortized cost	462,451
Debt securities, total amortized cost	512,492
Available-for-sale securities, total amortized cost	512,492	511,305
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	3,729
Debt securities, maturing 5 to 10 years, fair value	45,370
Debt securities, maturing over 10 years, fair value	454,475
Debt securities, total fair value	503,574
Available-for-sale securities, total fair value	503,574	514,096
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	5,305
Debt securities, maturing 5 to 10 years, amortized cost	23,203
Debt securities, maturing over 10 years, amortized cost	5,538
Debt securities, total amortized cost	34,046
Available-for-sale securities, total amortized cost	34,046	62,129
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	5,507
Debt securities, maturing 5 to 10 years, fair value	22,719
Debt securities, maturing over 10 years, fair value	5,380
Debt securities, total fair value	33,606
Available-for-sale securities, total fair value	33,606	64,416
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities [Line Items]
Other securities, maturing over 10 years, amortized cost	8,500
Other securities, total amortized cost	8,500
Available-for-sale securities, total amortized cost	8,500	10,966
Other securities, maturing over 10 years, fair value	7,811
Other securities, total fair value	7,811
Available-for-sale securities, total fair value	7,811	10,357
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Other securities, total amortized cost	1,213
Available-for-sale securities, total amortized cost	1,213	1,214
Other securities, total fair value	4,335
Available-for-sale securities, total fair value	$ 4,335	$ 4,106

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration