Fair Value (Assets and Liabilities Measured at Fair Value on Non-Recurring Basis) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets
Impaired loans	$ 1,251,027	$ 1,236,112
Fair Value, Measurements, Nonrecurring [Member]
Assets
Impaired loans	18,938	16,953
Fair Value, Measurements, Nonrecurring [Member] | Commercial [Member]
Assets
Impaired loans	4,972	2,215
Fair Value, Measurements, Nonrecurring [Member] | Construction [Member]
Assets
Impaired loans	1,802	1,875
Fair Value, Measurements, Nonrecurring [Member] | Owner Occupied Properties [Member] | Non Residential [Member]
Assets
Impaired loans	6,437	5,673
Fair Value, Measurements, Nonrecurring [Member] | Non Owner Occupied Properties [Member] | Non Residential [Member]
Assets
Impaired loans	221	942
Fair Value, Measurements, Nonrecurring [Member] | Home Equity Line of Credit [Member] | Residential Real Estate [Member]
Assets
Impaired loans	153	218
Fair Value, Measurements, Nonrecurring [Member] | Multifamily properties [Member] | Residential Real Estate [Member]
Assets
Impaired loans	1,247	1,245
Fair Value, Measurements, Nonrecurring [Member] | Residential [Member] | Other Real Estate Owned [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Other [Member] | Residential Real Estate [Member]
Assets
Impaired loans	1,541	2,013
Fair Value, Measurements, Nonrecurring [Member] | Non - Residential Real Estate [Member] | Other Real Estate Owned [Member]
Assets
Impaired loans	2,565	2,772
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commercial [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Construction [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Owner Occupied Properties [Member] | Non Residential [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Non Owner Occupied Properties [Member] | Non Residential [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Home Equity Line of Credit [Member] | Residential Real Estate [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Multifamily properties [Member] | Residential Real Estate [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential [Member] | Other Real Estate Owned [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other [Member] | Residential Real Estate [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Non - Residential Real Estate [Member] | Other Real Estate Owned [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commercial [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Construction [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Owner Occupied Properties [Member] | Non Residential [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Non Owner Occupied Properties [Member] | Non Residential [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Home Equity Line of Credit [Member] | Residential Real Estate [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Multifamily properties [Member] | Residential Real Estate [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Residential [Member] | Other Real Estate Owned [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other [Member] | Residential Real Estate [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Non - Residential Real Estate [Member] | Other Real Estate Owned [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets
Impaired loans	18,938	16,953
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commercial [Member]
Assets
Impaired loans	4,972	2,215
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Construction [Member]
Assets
Impaired loans	1,802	1,875
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Owner Occupied Properties [Member] | Non Residential [Member]
Assets
Impaired loans	6,437	5,673
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Non Owner Occupied Properties [Member] | Non Residential [Member]
Assets
Impaired loans	221	942
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Home Equity Line of Credit [Member] | Residential Real Estate [Member]
Assets
Impaired loans	153	218
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Multifamily properties [Member] | Residential Real Estate [Member]
Assets
Impaired loans	1,247	1,245
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Residential [Member] | Other Real Estate Owned [Member]
Assets
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other [Member] | Residential Real Estate [Member]
Assets
Impaired loans	1,541	2,013
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Non - Residential Real Estate [Member] | Other Real Estate Owned [Member]
Assets
Impaired loans	$ 2,565	$ 2,772