Regulatory Restrictions (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Company
Total capital ratio, actual	$ 359,554	$ 355,897
Tier I capital ratio, actual	332,350	329,100
Leverage ratio, actual	332,350	329,100
Total capital ratio, for capital adequacy purposes	172,572	170,329
Tier I capital ratio, for capital adequacy purposes	86,286	85,165
Leverage ratio, for capital adequacy purposes	129,820	128,910
Total capital ratio, to be well capitalized under prompt corrective action provisions
Tier I capital ratio, to be well capitalized under prompt corrective action provisions
Leverage ratio, to be well capitalized under prompt corrective action provisions
Total capital ratio, actual	16.67%	16.72%
Tier I capital ratio, actual	15.41%	15.46%
Leverage ratio, actual	10.24%	10.21%
Total capital ratio, for capital adequacy purposes	8.00%	8.00%
Tier I capital ratio, for capital adequacy purposes	4.00%	4.00%
Leverage ratio, for capital adequacy purposes	4.00%	4.00%
Total capital ratio, to be well capitalized under prompt corrective action provisions
Tier I capital ratio, to be well capitalized under prompt corrective action provisions
Leverage ratio, to be well capitalized under prompt corrective action provisions
Bank
Total capital ratio, actual	358,098	354,235
Tier I capital ratio, actual	330,916	327,461
Leverage ratio, actual	330,916	327,461
Total capital ratio, for capital adequacy purposes	172,424	170,180
Tier I capital ratio, for capital adequacy purposes	86,212	85,090
Leverage ratio, for capital adequacy purposes	129,742	128,831
Total capital ratio, to be well capitalized under prompt corrective action provisions	215,530	212,725
Tier I capital ratio, to be well capitalized under prompt corrective action provisions	129,318	127,635
Leverage ratio, to be well capitalized under prompt corrective action provisions	$ 162,178	$ 161,039
Total capital ratio, actual	16.61%	16.65%
Tier I capital ratio, actual	15.35%	15.39%
Leverage ratio, actual	10.20%	10.17%
Total capital ratio, for capital adequacy purposes	8.00%	8.00%
Tier I capital ratio, for capital adequacy purposes	4.00%	4.00%
Leverage ratio, for capital adequacy purposes	4.00%	4.00%
Total capital ratio, to be well capitalized under prompt corrective action provisions	10.00%	10.00%
Tier I capital ratio, to be well capitalized under prompt corrective action provisions	6.00%	6.00%
Leverage ratio, to be well capitalized under prompt corrective action provisions	5.00%	5.00%