Regulatory Matters (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Company
Total capital (to risk-weighted assets), Amount
Total Capital, Actual	$ 851,349,000	$ 819,408,000
Total Capital, Required For Capital Adequacy Purposes	457,059,000	439,687,000
Tier I capital (to risk-weighted assets), Amount
Tier I Capital, Actual (Risk Based)	783,006,000	751,204,000
Tier I Capital, Required For Capital Adequacy Purposes	228,530,000	219,844,000
Tier I capital (to average assets), Amount
Tier I Capital, Actual (Leverage)	783,006,000	751,204,000
Tier I Capital, Required For Capital Adequacy Purposes	268,720,000	251,049,000
Total capital and Tier I capital (to risk-weighted assets), Ratio
Total Capital (to Risk Weighted Assets), Actual	14.90%	14.90%
Total Capital (to Risk Weighted Assets), Minimum For Capital Adequacy Purposes	8.00%	8.00%
Tier I Capital (to Risk Weighted Assets), Actual (Risk Based)	13.71%	13.66%
Tier I Capital (to Risk Weighted Assets), Minimum For Capital Adequacy Purposes (Risk Based)	4.00%	4.00%
Tier I capital (to average assets), Ratio
Tier I Capital (to Average Assets), Actual (Leverage)	11.66%	11.97%
Tier I Capital (to Average Assets), Minimum For Capital Adequacy Purposes (Leverage)	4.00%	4.00%
Bank
Total capital (to risk-weighted assets), Amount
Total Capital, Actual	837,650,000	807,620,000
Total Capital, Required For Capital Adequacy Purposes	456,714,000	439,437,000
Required To Be Well Capitalized under Prompt Corrective Action Provisions	570,893,000	549,471,000
Tier I capital (to risk-weighted assets), Amount
Tier I Capital, Actual (Risk Based)	769,307,000	739,416,000
Tier I Capital, Required For Capital Adequacy Purposes	228,357,000	219,798,000
Tier I Capital, Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Risk Based)	342,536,000	329,683,000
Tier I capital (to average assets), Amount
Tier I Capital, Actual (Leverage)	769,307,000	739,416,000
Tier I Capital, Required For Capital Adequacy Purposes	268,649,000	250,954,000
Tier I Capital, Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Leverage)	$ 335,811,000	$ 313,687,000
Total capital and Tier I capital (to risk-weighted assets), Ratio
Total Capital (to Risk Weighted Assets), Actual	14.67%	14.70%
Total Capital (to Risk Weighted Assets), Minimum For Capital Adequacy Purposes	8.00%	8.00%
Total Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions	10.00%	10.00%
Tier I Capital (to Risk Weighted Assets), Actual (Risk Based)	13.48%	13.46%
Tier I Capital (to Risk Weighted Assets), Minimum For Capital Adequacy Purposes (Risk Based)	4.00%	4.00%
Tier I Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Risk Based)	6.00%	6.00%
Tier I capital (to average assets), Ratio
Tier I Capital (to Average Assets), Actual (Leverage)	11.45%	11.79%
Tier I Capital (to Average Assets), Minimum For Capital Adequacy Purposes (Leverage)	4.00%	4.00%
Tier I Capital (to Average Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Leverage)	5.00%	5.00%