Loans and Allowance for Loan Losses, Risk Category of Loans (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Net loans	$ 2,511,603	$ 2,472,586
New York and other states [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	210,535	222,927
New York and other states [Member] | Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	199,622	215,530
New York and other states [Member] | Commercial [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	10,913	7,397
New York and other states [Member] | Commercial [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	183,365	189,193
New York and other states [Member] | Commercial [Member] | Commercial real estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	172,628	181,809
New York and other states [Member] | Commercial [Member] | Commercial real estate [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	10,737	7,384
New York and other states [Member] | Commercial [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	27,170	33,734
New York and other states [Member] | Commercial [Member] | Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	26,994	33,721
New York and other states [Member] | Commercial [Member] | Other [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	176	13
Florida [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	24,812	25,236
Florida [Member] | Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	13,777	17,636
Florida [Member] | Commercial [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	11,035	7,600
Florida [Member] | Commercial [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	24,696	25,134
Florida [Member] | Commercial [Member] | Commercial real estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	13,661	17,534
Florida [Member] | Commercial [Member] | Commercial real estate [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	11,035	7,600
Florida [Member] | Commercial [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	116	102
Florida [Member] | Commercial [Member] | Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	116	102
Florida [Member] | Commercial [Member] | Other [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	$ 0	$ 0