Investment Securities (Available-for-sale Securities by Maturities) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2012	Dec. 31, 2011
Investments [Abstract]
Federal income tax rate	35.00%
Schedule of Available-for-sale Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	$ 622
Debt securities, maturing 1 to 5 years, amortized cost	9,813
Debt securities, maturing 5 to 10 years, amortized cost	100,165
Available-for-sale securities, maturing over 10 years, amortized cost	467,908
Available-for-sale securities, total amortized cost	579,722	617,128
Debt securities, maturing within 1 year, fair value	627
Debt securities, maturing 1 to 5 years, fair value	10,351
Debt securities, maturing 5 to 10 years, fair value	104,650
Available-for-sale securities, maturing over 10 years, fair value	471,018
Available-for-sale securities, total fair value	589,360	628,571
Available-for-sale securities, maturing within 1 year, average yield	6.31%
Available-for-sale securities, maturing 1 to 5 years, average yield	4.13%
Available-for-sale securities, maturing 5 to 10 years, average yield	3.73%
Available-for-sale securities, maturing over 10 years, average yield	3.56%
Available-for-sale securities, total average yield	3.60%
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	9
Debt securities, maturing 5 to 10 years, amortized cost	19
Debt securities, maturing over 10 years, amortized cost	0
Debt securities, total amortized cost	28
Available-for-sale securities, total amortized cost	28	32
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	9
Debt securities, maturing 5 to 10 years, fair value	19
Debt securities, maturing over 10 years, fair value	0
Debt securities, total fair value	28
Available-for-sale securities, total fair value	28	32
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	540
Debt securities, maturing 5 to 10 years, amortized cost	0
Debt securities, maturing over 10 years, amortized cost	0
Debt securities, total amortized cost	540
Available-for-sale securities, total amortized cost	540	12,291
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	575
Debt securities, maturing 5 to 10 years, fair value	0
Debt securities, maturing over 10 years, fair value	0
Debt securities, total fair value	575
Available-for-sale securities, total fair value	575	13,037
States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	613
Debt securities, maturing 1 to 5 years, amortized cost	3,101
Debt securities, maturing 5 to 10 years, amortized cost	11,175
Debt securities, maturing over 10 years, amortized cost	23,652
Debt securities, total amortized cost	38,541
Available-for-sale securities, total amortized cost	38,541	32,763
Debt securities, maturing within 1 year, fair value	618
Debt securities, maturing 1 to 5 years, fair value	3,203
Debt securities, maturing 5 to 10 years, fair value	12,388
Debt securities, maturing over 10 years, fair value	25,945
Debt securities, total fair value	42,154
Available-for-sale securities, total fair value	42,154	35,745
Residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	9
Debt securities, maturing 1 to 5 years, amortized cost	801
Debt securities, maturing 5 to 10 years, amortized cost	50,768
Debt securities, maturing over 10 years, amortized cost	417,936
Debt securities, total amortized cost	469,514
Available-for-sale securities, total amortized cost	469,514	521,231
Debt securities, maturing within 1 year, fair value	9
Debt securities, maturing 1 to 5 years, fair value	854
Debt securities, maturing 5 to 10 years, fair value	52,470
Debt securities, maturing over 10 years, fair value	419,106
Debt securities, total fair value	472,439
Available-for-sale securities, total fair value	472,439	527,003
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	5,362
Debt securities, maturing 5 to 10 years, amortized cost	38,203
Debt securities, maturing over 10 years, amortized cost	15,358
Debt securities, total amortized cost	58,923
Available-for-sale securities, total amortized cost	58,923	35,712
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	5,710
Debt securities, maturing 5 to 10 years, fair value	39,773
Debt securities, maturing over 10 years, fair value	15,862
Debt securities, total fair value	61,345
Available-for-sale securities, total fair value	61,345	37,289
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities [Line Items]
Other securities, maturing over 10 years, amortized cost	10,962
Other securities, total amortized cost	10,962
Available-for-sale securities, total amortized cost	10,962	13,886
Other securities, maturing over 10 years, fair value	10,105
Other securities, total fair value	10,105
Available-for-sale securities, total fair value	10,105	12,211
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Other securities, total amortized cost	1,214
Available-for-sale securities, total amortized cost	1,214	1,213
Other securities, total fair value	2,714
Available-for-sale securities, total fair value	$ 2,714	$ 3,254

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