Past Due Loans, Allowance For Credit Losses, Impaired Loans and TDRS Past Due Loans, Allowance for Credit Losses, Impaired Loans, and TDRs (Details) - Loans Restructured During the Period $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) loan	Sep. 30, 2014 USD ($) loan	Sep. 30, 2015 USD ($) loan	Sep. 30, 2014 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	3	6	3	7
Pre-Modification Recorded Investment	$ 445	$ 23,432	$ 445	$ 23,507
Funds Disbursed	0	0	0	0
Interest and Escrow Capitalized	0	0	0	0
Charge-offs	0	0	0	0
Post-Modification Recorded Investment	$ 445	$ 23,432	$ 445	$ 23,507
Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1		1	1
Pre-Modification Recorded Investment	$ 120		$ 120	$ 75
Funds Disbursed	0		0	0
Interest and Escrow Capitalized	0		0	0
Charge-offs	0		0	0
Post-Modification Recorded Investment	$ 120		$ 120	$ 75
1-4 family mortgage loans
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	2		2
Pre-Modification Recorded Investment	$ 325		$ 325
Funds Disbursed	0		0
Interest and Escrow Capitalized	0		0
Charge-offs	0		0
Post-Modification Recorded Investment	$ 325		$ 325
Commercial And Industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		5		5
Pre-Modification Recorded Investment		$ 23,015		$ 23,015
Funds Disbursed		0		0
Interest and Escrow Capitalized		0		0
Charge-offs		0		0
Post-Modification Recorded Investment		$ 23,015		$ 23,015
Office Retail and Industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		1		1
Pre-Modification Recorded Investment		$ 417		$ 417
Funds Disbursed		0		0
Interest and Escrow Capitalized		0		0
Charge-offs		0		0
Post-Modification Recorded Investment		$ 417		$ 417