Commitments And Contingencies Commitments and Contingencies Commercial Loan Swaps (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount		$ 43,000	$ 43,000
Derivative, Fair Value, Net	[1]	(9,229)	(9,143)
Forward-Starting Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount		50,000	$ 0
Derivative, Fair Value, Net	[2]	$ (576)
federal home loan bank 30-day [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held		28	10
Notional Amount		$ 142,944	$ 29,117
Derivative, Fair Value, Net		$ 3,166	$ 1,140
Commercial and Industrial Sector [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held		28	10
Notional Amount		$ 142,944	$ 29,117
Derivative, Fair Value, Net		$ (3,166)	$ (1,140)

[1] Presented within accrued interest and other liabilities on the consolidated statements of condition.

[2] (1) Presented within accrued interest and other liabilities on the consolidated statements of condition.