Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) trust	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Property, Plant and Equipment [Line Items]
Number Of Wholly Owned Trusts | trust	25
Cash And Cash Equivalents General Maturity	90 days
Unallocated Allowance Maximum Amount	5.00%
Federal Home Loan Bank Stock	$ 46,949,000	$ 119,334,000
Impairment charges related to SBA/USDA servicing assets	0	0	$ 0
Accounting Standards Update 2014-01 [Member]
Property, Plant and Equipment [Line Items]
Cumulative Effect Adjustment ASU 2014-01				$ (3,439,000)
Restatement Adjustment [Member] | Accounting Standards Update 2014-01 [Member]
Property, Plant and Equipment [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	$ (440,000)	138,000	$ (70,000)
Retained Earnings [Member] | Accounting Standards Update 2014-01 [Member]
Property, Plant and Equipment [Line Items]
Cumulative Effect Adjustment ASU 2014-01				(3,439,000)
Retained Earnings [Member] | Restatement Adjustment [Member] | Accounting Standards Update 2014-01 [Member]
Property, Plant and Equipment [Line Items]
Cumulative Effect Adjustment ASU 2014-01				$ (3,439,000)
Land and Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	39 years
Minimum [Member] | Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member] | Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
2013 Stock Incentive Plan [Member]
Property, Plant and Equipment [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Expiration Period	10 years
2013 Stock Incentive Plan [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Share-based compensation award, vesting period	3 years
2013 Stock Incentive Plan [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Share-based compensation award, vesting period	5 years
Investment in Federal Home Loan Bank Stock [Member]
Property, Plant and Equipment [Line Items]
Federal Home Loan Bank Stock	$ 45,500,000	$ 117,900,000
Federal home loan bank stock, minimum investment	$ 45,500,000