Regulatory Capital Requirements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Total risk-based capital:
Actual Regulatory Capital - Amount	$ 256,648	$ 239,831
Minimum Regulatory Capital Required - Amount	124,787	123,293
Actual Regulatory Capital - Amount	155,983	154,116
Capital To Risk Weighted Assets	16.45%	15.56%
Minimum Regulatory Capital Required - Ratio	8.00%	8.00%
Minimum Regulatory Provision To Be Well Capitalized - Ratio	10.00%	10.00%
Tier 1 capital:
Actual Regulatory Capital - Amount	237,124	220,519
Minimum Regulatory Capital Required - Amount	62,393	61,646
Minimum Regulatory Provision To Be Well Capitalized - Amount	93,590	92,469
Actual Regulatory Capital - Ratio	15.20%	14.31%
Minimum Regulatory Capital Required - Ratio	4.00%	4.00%
Minimum Regulatory Provision To Be Well Capitalized - Ratio	6.00%	6.00%
Tier 1 leverage capital ratio:
Actual Regulatory Capital - Amount	237,124	220,519
Minimum Regulatory Capital Required - Amount	102,551	100,770
Minimum Regulatory Provision To Be Well Capitalized - Amount	128,188	125,963
Actual Regulatory Capital - Ratio	9.43%	8.94%
Minimum Regulatory Capital Required - Ratio	4.00%	4.00%
Minimum Regulatory Provision To Be Well Capitalized - Ratio	5.00%	5.00%
Subsidiaries [Member]
Total risk-based capital:
Actual Regulatory Capital - Amount	228,375	213,435
Minimum Regulatory Capital Required - Amount	123,421	121,625
Actual Regulatory Capital - Amount	154,276	152,031
Capital To Risk Weighted Assets	14.80%	14.04%
Minimum Regulatory Capital Required - Ratio	8.00%	8.00%
Minimum Regulatory Provision To Be Well Capitalized - Ratio	10.00%	10.00%
Tier 1 capital:
Actual Regulatory Capital - Amount	209,062	194,381
Minimum Regulatory Capital Required - Amount	61,710	60,812
Minimum Regulatory Provision To Be Well Capitalized - Amount	92,566	91,219
Actual Regulatory Capital - Ratio	13.55%	12.79%
Minimum Regulatory Capital Required - Ratio	4.00%	4.00%
Minimum Regulatory Provision To Be Well Capitalized - Ratio	6.00%	6.00%
Tier 1 leverage capital ratio:
Actual Regulatory Capital - Amount	209,062	194,381
Minimum Regulatory Capital Required - Amount	101,439	99,347
Minimum Regulatory Provision To Be Well Capitalized - Amount	126,798	124,184
Actual Regulatory Capital - Ratio	8.39%	7.97%
Minimum Regulatory Capital Required - Ratio	4.00%	4.00%
Minimum Regulatory Provision To Be Well Capitalized - Ratio	5.00%	5.00%
Subsidiaries [Member]
Tier 1 capital:
Minimum Regulatory Capital Required - Amount	$ 2,500