Securities (Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities maturities within 1 year amortized cost	$ 104,409
Available for sale debt securities maturities 1-5 years amortized cost	147,498
Available for sale debt securities maturities 5-10 years amortized cost	19,655
Available for sale debt securities maturities after 10 years amortized cost	37,859
Available for sale debt securities maturities total amortized cost	309,421
Available for sale debt securities maturities within 1 year weighted average yield	4.76%
Available for sale debt securities maturities 1-5 years weighted average yield	3.91%
Available for sale debt securities maturities 5-10 years weighted average yield	2.63%
Available for sale debt securities maturities after 10 years weighted average yield	1.50%
Available for sale debt securities maturities total weighted average yield	3.82%
Available for sale debt securities maturities within 1 year fair value	106,699
Available for sale debt securities maturities 1-5 years fair value	151,379
Available for sale debt securities maturities 5-10 years fair value	20,461
Available for sale debt securities maturities after 10 years fair value	38,175
Available for sale debt securities fair value	316,714
Held to maturity debt securities maturities total amortized cost	33,803	40,381
Held to maturity debt securities maturities within 1 year fair value	8,982
Held to maturity debt securities maturities 1-5 years fair value	17,788
Held to maturity debt securities maturities 5-10 years fair value	5,833
Held to maturity debt securities maturities after 10 years fair value	1,159
Held to maturity securities fair value	33,762	41,420
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities maturities within 1 year amortized cost	5,031
Available for sale debt securities maturities 1-5 years amortized cost	5,704
Available for sale debt securities maturities 5-10 years amortized cost	402
Available for sale debt securities maturities after 10 years amortized cost	0
Available for sale debt securities maturities total amortized cost	11,137
Available for sale debt securities maturities within 1 year weighted average yield	6.63%
Available for sale debt securities maturities 1-5 years weighted average yield	2.84%
Available for sale debt securities maturities 5-10 years weighted average yield	2.44%
Available for sale debt securities maturities after 10 years weighted average yield	0.00%
Available for sale debt securities maturities total weighted average yield	4.54%
Available for sale debt securities fair value	11,389	14,381
Trust Preferred Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities maturities within 1 year amortized cost	0
Available for sale debt securities maturities 1-5 years amortized cost	0
Available for sale debt securities maturities 5-10 years amortized cost	0
Available for sale debt securities maturities after 10 years amortized cost	31,960
Available for sale debt securities maturities total amortized cost	31,960
Available for sale debt securities maturities within 1 year weighted average yield	0.00%
Available for sale debt securities maturities 1-5 years weighted average yield	0.00%
Available for sale debt securities maturities 5-10 years weighted average yield	0.00%
Available for sale debt securities maturities after 10 years weighted average yield	1.31%
Available for sale debt securities maturities total weighted average yield	1.31%
States and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities maturities within 1 year amortized cost	10,666
Available for sale debt securities maturities 1-5 years amortized cost	54,172
Available for sale debt securities maturities 5-10 years amortized cost	0
Available for sale debt securities maturities after 10 years amortized cost	0
Available for sale debt securities maturities total amortized cost	64,838
Available for sale debt securities maturities within 1 year weighted average yield	3.93%
Available for sale debt securities maturities 1-5 years weighted average yield	3.90%
Available for sale debt securities maturities 5-10 years weighted average yield	0.00%
Available for sale debt securities maturities after 10 years weighted average yield	0.00%
Available for sale debt securities maturities total weighted average yield	3.91%
Available for sale debt securities fair value	67,688	72,620
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities maturities within 1 year amortized cost	59,240
Available for sale debt securities maturities 1-5 years amortized cost	87,622
Available for sale debt securities maturities 5-10 years amortized cost	19,253
Available for sale debt securities maturities after 10 years amortized cost	5,899
Available for sale debt securities maturities total amortized cost	172,014
Available for sale debt securities maturities within 1 year weighted average yield	4.44%
Available for sale debt securities maturities 1-5 years weighted average yield	3.98%
Available for sale debt securities maturities 5-10 years weighted average yield	2.63%
Available for sale debt securities maturities after 10 years weighted average yield	2.51%
Available for sale debt securities maturities total weighted average yield	3.94%
Available for sale debt securities fair value	181,225	231,233
Held to maturity debt securities maturities within 1 year amortized cost	8,993
Held to maturity debt securities maturities 1-5 years amortized cost	17,810
Held to maturity debt securities maturities 5-10 years amortized cost	5,840
Held to maturity debt securities maturities after 10 years amortized cost	1,160
Held to maturity debt securities maturities total amortized cost	33,803	40,381
Held to maturity debt securities maturities within 1 year weighted average yield	2.40%
Held to maturity debt securities maturities 1-5 years weighted average yield	2.27%
Held to maturity debt securities maturities 5-10 years weighted average yield	2.11%
Held to maturity debt securities maturities after 10 years weighted average yield	0.80%
Held to maturity debt securities maturities total weighted average yield	2.23%
Held to maturity securities fair value	33,762	41,420
Obligations of U.S. government-sponsored enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities maturities within 1 year amortized cost	29,472
Available for sale debt securities maturities 1-5 years amortized cost	0
Available for sale debt securities maturities 5-10 years amortized cost	0
Available for sale debt securities maturities after 10 years amortized cost	0
Available for sale debt securities maturities total amortized cost	29,472
Available for sale debt securities maturities within 1 year weighted average yield	5.40%
Available for sale debt securities maturities 1-5 years weighted average yield	0.00%
Available for sale debt securities maturities 5-10 years weighted average yield	0.00%
Available for sale debt securities maturities after 10 years weighted average yield	0.00%
Available for sale debt securities maturities total weighted average yield	5.40%
Available for sale debt securities fair value	$ 30,938	$ 31,670