Investment Securities (Available-for-sale Securities by Maturities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 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	$ 360
Debt securities, maturing 1 to 5 years, amortized cost	9,911
Debt securities, maturing 5 to 10 years, amortized cost	93,624
Available-for-sale securities, maturing over 10 years, amortized cost	486,897
Available-for-sale securities, total amortized cost	592,005	628,584
Debt securities, maturing within 1 year, fair value	367
Debt securities, maturing 1 to 5 years, fair value	10,491
Debt securities, maturing 5 to 10 years, fair value	96,478
Available-for-sale securities, maturing over 10 years, fair value	491,399
Available-for-sale securities, total fair value	602,645	639,185
Available-for-sale securities, maturing within 1 year, average yield	5.88%
Available-for-sale securities, maturing 1 to 5 years, average yield	3.85%
Available-for-sale securities, maturing 5 to 10 years, average yield	3.17%
Available-for-sale securities, maturing over 10 years, average yield	2.99%
Available-for-sale securities, total average yield	3.03%
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	22
Debt securities, maturing 5 to 10 years, amortized cost	3
Debt securities, maturing over 10 years, amortized cost	0
Debt securities, total amortized cost	25
Available-for-sale securities, total amortized cost	25	26
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	22
Debt securities, maturing 5 to 10 years, fair value	3
Debt securities, maturing over 10 years, fair value	0
Debt securities, total fair value	25
Available-for-sale securities, total fair value	25	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	435
Debt securities, maturing 5 to 10 years, amortized cost	0
Debt securities, maturing over 10 years, amortized cost	0
Debt securities, total amortized cost	435
Available-for-sale securities, total amortized cost	435	486
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	459
Debt securities, maturing 5 to 10 years, fair value	0
Debt securities, maturing over 10 years, fair value	0
Debt securities, total fair value	459
Available-for-sale securities, total fair value	459	516
States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	360
Debt securities, maturing 1 to 5 years, amortized cost	1,572
Debt securities, maturing 5 to 10 years, amortized cost	15,103
Debt securities, maturing over 10 years, amortized cost	27,429
Debt securities, total amortized cost	44,464
Available-for-sale securities, total amortized cost	44,464	42,458
Debt securities, maturing within 1 year, fair value	367
Debt securities, maturing 1 to 5 years, fair value	1,699
Debt securities, maturing 5 to 10 years, fair value	16,342
Debt securities, maturing over 10 years, fair value	28,757
Debt securities, total fair value	47,165
Available-for-sale securities, total fair value	47,165	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	2,558
Debt securities, maturing 5 to 10 years, amortized cost	51,735
Debt securities, maturing over 10 years, amortized cost	435,995
Debt securities, total amortized cost	490,288
Available-for-sale securities, total amortized cost	490,288	511,305
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	2,690
Debt securities, maturing 5 to 10 years, fair value	52,925
Debt securities, maturing over 10 years, fair value	439,520
Debt securities, total fair value	495,135
Available-for-sale securities, total fair value	495,135	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	5,324
Debt securities, maturing 5 to 10 years, amortized cost	26,783
Debt securities, maturing over 10 years, amortized cost	14,977
Debt securities, total amortized cost	47,084
Available-for-sale securities, total amortized cost	47,084	62,129
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	5,621
Debt securities, maturing 5 to 10 years, fair value	27,208
Debt securities, maturing over 10 years, fair value	15,243
Debt securities, total fair value	48,072
Available-for-sale securities, total fair value	48,072	64,416
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities [Line Items]
Other securities, maturing over 10 years, amortized cost	8,496
Other securities, total amortized cost	8,496
Available-for-sale securities, total amortized cost	8,496	10,966
Other securities, maturing over 10 years, fair value	7,879
Other securities, total fair value	7,879
Available-for-sale securities, total fair value	7,879	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	3,910
Available-for-sale securities, total fair value	$ 3,910	$ 4,106

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