Quantitative Information about Level 3 Fair Value Measurements (Details) (Non-Recurring Measurements, USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	11,445		18,480
Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	11,445		18,480
Other real estate owned | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value			3,000
Other real estate owned | Sales Comparison Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	535		2,393
Other real estate owned | Combined Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value			607
Other real estate owned | Minimum Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	8.00%	[1]	0.00%	[1]
Adjustment to Comparables			0.00%	[1]
Other real estate owned | Minimum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs			10.00%	[1]
Discount Rate			10.00%	[1]
Other real estate owned | Maximum Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	8.00%	[1]	10.00%	[1]
Adjustment to Comparables			7.00%	[1]
Other real estate owned | Maximum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs			10.00%	[1]
Discount Rate			10.00%	[1]
Other real estate owned | Weighted Average Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	8.00%	[1]	5.80%	[1]
Adjustment to Comparables			0.50%	[1]
Other real estate owned | Weighted Average Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs			10.00%	[1]
Discount Rate			10.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	10,910		15,480
Collateral-dependent Impaired Loans, Net of ALLL | Sales Comparison Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	5,616		6,330
Collateral-dependent Impaired Loans, Net of ALLL | Cost Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	378		6
Collateral-dependent Impaired Loans, Net of ALLL | Combined Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value	4,916		3,809
Collateral-dependent Impaired Loans, Net of ALLL | Income Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value			5,335
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 | Cost Approach | Level 3
Unobservable Inputs
Selling Costs	7.00%	[1]	7.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Minimum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	10.00%	[1]	8.00%	[1]
Adjustment to Comparables	20.00%	[1]	10.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Minimum Range | Income Approach | Level 3
Unobservable Inputs
Selling Costs			8.00%	[1]
Discount Rate			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	5.00%	[1]	30.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Maximum Range | Cost Approach | Level 3
Unobservable Inputs
Selling Costs	10.00%	[1]	7.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Maximum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	10.00%	[1]	10.00%	[1]
Adjustment to Comparables	20.00%	[1]	20.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Maximum Range | Income Approach | Level 3
Unobservable Inputs
Selling Costs			10.00%	[1]
Discount Rate			12.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Weighted Average Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	8.70%	[1]	8.30%	[1]
Adjustment to Comparables	0.00%	[1]	3.50%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Weighted Average Range | Cost Approach | Level 3
Unobservable Inputs
Selling Costs	8.80%	[1]	7.00%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Weighted Average Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	10.00%	[1]	9.20%	[1]
Adjustment to Comparables	20.00%	[1]	16.20%	[1]
Collateral-dependent Impaired Loans, Net of ALLL | Weighted Average Range | Income Approach | Level 3
Unobservable Inputs
Selling Costs			8.50%	[1]
Discount Rate			9.10%	[1]

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