Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014 Contract Loan	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2014 Commercial and Industrial [Member] Contract	Sep. 30, 2013 Commercial and Industrial [Member] Contract	Sep. 30, 2014 Commercial and Industrial [Member] Contract	Sep. 30, 2013 Commercial and Industrial [Member] Contract	Sep. 30, 2014 Commercial Real Estate [Member] Contract	Sep. 30, 2013 Commercial Real Estate [Member] Contract	Sep. 30, 2014 Commercial Real Estate [Member] Contract	Sep. 30, 2013 Commercial Real Estate [Member] Contract	Sep. 30, 2014 Construction and Land [Member] Contract	Sep. 30, 2013 Construction and Land [Member] Contract	Sep. 30, 2014 Construction and Land [Member] Contract	Sep. 30, 2013 Construction and Land [Member] Contract	Sep. 30, 2014 Consumer [Member] Contract	Sep. 30, 2013 Consumer [Member] Contract	Sep. 30, 2014 Consumer [Member] Contract	Sep. 30, 2013 Consumer [Member] Contract	Sep. 30, 2014 Residential Real Estate [Member] Contract	Sep. 30, 2013 Residential Real Estate [Member] Contract	Sep. 30, 2014 Residential Real Estate [Member] Contract	Sep. 30, 2013 Residential Real Estate [Member] Contract	Sep. 30, 2014 Home Equity Line of Credit [Member] Contract	Sep. 30, 2013 Home Equity Line of Credit [Member] Contract	Sep. 30, 2014 Home Equity Line of Credit [Member] Contract	Sep. 30, 2013 Home Equity Line of Credit [Member] Contract	Sep. 30, 2014 Student US Government Guaranteed [Member] Contract	Sep. 30, 2013 Student US Government Guaranteed [Member] Contract	Sep. 30, 2014 Student US Government Guaranteed [Member] Contract	Sep. 30, 2013 Student US Government Guaranteed [Member] Contract
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, number of contracts	0			0	2	2	2	0	0	0	2	0	1	0	2	0	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0
Troubled debt restructurings, pre-modification outstanding recorded investment	$ 0			$ 0	$ 292	$ 198	$ 292	$ 0	$ 0	$ 0	$ 2,010	$ 0	$ 1,673	$ 0	$ 2,481	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 300	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Troubled debt restructurings, post-modification outstanding recorded investment				0	94	198	94	0	0	0	2,010	0	1,673	0	2,481	0	0	0	0	0	0	0	300	0	0	0	0	0	0	0	0
Troubled debt restructurings that subsequently defaulted, number of contracts				0	0	0	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Troubled debt restructurings that subsequently defaulted, pre-modification outstanding recorded investment				0	0	0	237	0	0	0	0	0	0	0	0		0	0	0	0	0	0	0		0	0	0		0	0	0
Troubled debt restructurings that subsequently defaulted, post-modification outstanding recorded investment				0	0	0	237	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Number of TDR loans secured by business assets	15
TDR loans value	9,406
Number of TDR loans current and performing	11
TDR loans current and performing	8,323
Number of TDR loans not performing in accordance with the modified terms	4
TDR loans not performing in accordance with modified terms	1,083
Non-performing Assets, Restructured Loans Still Accruing and Loans Contractually Past Due [Abstract]
Non-accrual loans	2,233	2,184	5,060
Other real estate owned	1,406	4,085	1,406
Non-performing corporate bond investments, at fair value	0	1,300	128
Total non-performing assets	3,639	7,569	6,594
Restructured loans still accruing	8,323	8,613	8,564
Student Loans 90 PD Still Accruing	4,059	7,917	3,629
Loans past due 90 or more days and still accruing	0	506	1
Total non-performing and other risk assets	$ 16,021	$ 24,605	$ 18,788
Allowance for loan losses to total loans (in hundredths)	1.51%	1.48%	1.42%
Non-accrual loans to total loans (in hundredths)	0.51%	0.48%	1.11%
Allowance for loan losses to non-accrual loans (in hundredths)	295.34%	305.27%	128.08%
Total non-accrual loans and restructured loans still accruing to total loans (in hundredths)	2.41%	2.39%	2.99%
Allowance for loan losses to non-accrual loans and restructured loans still accruing (in hundredths)	62.48%	61.75%	47.57%
Total non-performing assets to total assets (in hundredths)	0.62%	1.23%	1.11%