Fair Value of Assets and Liabilities Quantitative Information about Level 3 Fair Value Measurements (Details) (Nonrecurring Measurements, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	18,480		29,558
Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	18,480		29,558
Other real estate owned | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	3,000		10,888
Other real estate owned | Sales Comparison Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	2,393		9,278
Other real estate owned | Combined Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	607		1,610
Other real estate owned | Minimum Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	0.00%	[1]	7.00%	[1]
Adjustment to Comparables	0.00%	[1]	0.00%	[1]
Other real estate owned | Minimum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	10.00%	[1]	5.00%	[1]
Discount Rate	10.00%	[1]	8.50%	[1]
Adjustment to Comparables			25.00%	[1]
Other real estate owned | Maximum Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	10.00%	[1]	10.00%	[1]
Adjustment to Comparables	7.00%	[1]	37.50%	[1]
Other real estate owned | Maximum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	10.00%	[1]	10.00%	[1]
Discount Rate	10.00%	[1]	8.50%	[1]
Adjustment to Comparables			25.00%	[1]
Other real estate owned | Weighted Average Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	5.80%	[1]	7.70%	[1]
Adjustment to Comparables	0.50%	[1]	1.40%	[1]
Other real estate owned | Weighted Average Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	10.00%	[1]	7.50%	[1]
Discount Rate	10.00%	[1]	8.50%	[1]
Adjustment to Comparables			25.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	15,480		18,670
Collateral-dependent Impaired Loans, Net of ALLL | Sales Comparison Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	6,330		11,784
Collateral-dependent Impaired Loans, Net of ALLL | Combined Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	3,809		2,810
Collateral-dependent Impaired Loans, Net of ALLL | Cost Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	6
Collateral-dependent Impaired Loans, Net of ALLL | Income Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	5,335		4,076
Collateral-dependent Impaired Loans, Net of ALLL | Minimum Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	0.00%	[1]	0.00%	[1]
Adjustment to Comparables	0.00%	[1]	0.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Minimum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	8.00%	[1]	0.00%	[1]
Discount Rate			7.30%	[1]
Adjustment to Comparables	10.00%	[1]	10.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Minimum Range | Cost Approach | Level 3
Unobservable Inputs
Selling Costs	7.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Minimum Range | Income Approach | Level 3
Unobservable Inputs
Selling Costs	8.00%	[1]	8.00%	[1]
Discount Rate	8.30%	[1]	8.30%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Maximum Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	10.00%	[1]	10.00%	[1]
Adjustment to Comparables	30.00%	[1]	1.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Maximum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	10.00%	[1]	8.00%	[1]
Discount Rate			7.30%	[1]
Adjustment to Comparables	20.00%	[1]	50.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Maximum Range | Cost Approach | Level 3
Unobservable Inputs
Selling Costs	7.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Maximum Range | Income Approach | Level 3
Unobservable Inputs
Selling Costs	10.00%	[1]	8.00%	[1]
Discount Rate	12.00%	[1]	8.30%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Weighted Average Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	8.30%	[1]	7.90%	[1]
Adjustment to Comparables	3.50%	[1]	0.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Weighted Average Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	9.20%	[1]	7.80%	[1]
Discount Rate			7.30%	[1]
Adjustment to Comparables	16.20%	[1]	18.90%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Weighted Average Range | Cost Approach | Level 3
Unobservable Inputs
Selling Costs	7.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Weighted Average Range | Income Approach | Level 3
Unobservable Inputs
Selling Costs	8.50%	[1]	8.00%	[1]
Discount Rate	9.10%	[1]	8.30%	[1]

[1] The range for selling costs and adjustments to comparables indicate reductions to the fair value.