Note 5 - Fair Value (Detail) - Financial Instruments (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financial Assets:
Carrying Amount	$ 1,485,738	$ 1,485,299
Financial Liabilities:
Carrying Amount	1,340,595	1,329,922
Non-interest Bearing Deposits [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Liabilities:
Estimated Fair Value	(217,824)
Non-interest Bearing Deposits [Member]
Financial Liabilities:
Carrying Amount	(217,824)	(214,904)
Estimated Fair Value	(217,824)	(214,904)
Interest Bearing Deposit Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Liabilities:
Estimated Fair Value	(994,040)
Interest Bearing Deposit Liabilities [Member]
Financial Liabilities:
Carrying Amount	(994,022)	(1,005,638)
Estimated Fair Value	(994,040)	(1,000,580)
Securities Loaned or Sold under Agreements to Repurchase [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Liabilities:
Estimated Fair Value	(45,746)
Securities Loaned or Sold under Agreements to Repurchase [Member]
Financial Liabilities:
Carrying Amount	(45,746)	(46,784)
Estimated Fair Value	(45,746)	(46,784)
Federal Home Loan Bank Advance [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Liabilities:
Estimated Fair Value	(26,120)
Federal Home Loan Bank Advance [Member]
Financial Liabilities:
Carrying Amount	(24,334)	(19,457)
Estimated Fair Value	(26,120)	(21,359)
Accrued Interest Payable [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Liabilities:
Estimated Fair Value	(613)
Accrued Interest Payable [Member]
Financial Liabilities:
Carrying Amount	(613)	(762)
Estimated Fair Value	(613)	(762)
Subordinated Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Liabilities:
Estimated Fair Value	(44,274)
Subordinated Debt Obligations [Member]
Financial Liabilities:
Carrying Amount	(36,084)	(36,084)
Estimated Fair Value	(44,274)	(36,488)
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	91,172
Cash and Cash Equivalents [Member]
Financial Assets:
Carrying Amount	91,172	75,816
Estimated Fair Value	91,172	75,816
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	2,927
Certificates of Deposit [Member]
Financial Assets:
Carrying Amount	2,927	4,432
Estimated Fair Value	2,927	4,432
Trading Account Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	7
Trading Account Assets [Member]
Financial Assets:
Carrying Amount	7	2
Estimated Fair Value	7	2
Securities Available For Sale [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	100
Securities Available For Sale [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	310,863
Securities Available For Sale [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	15,710
Securities Available For Sale [Member]
Financial Assets:
Carrying Amount	326,673	342,184
Estimated Fair Value	326,673	342,184
Federal Home Loan Bank Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	7,266
Federal Home Loan Bank Stock [Member]
Financial Assets:
Carrying Amount	7,266	7,266
Estimated Fair Value	7,266	7,266
Loans Held For Sale [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	3,857
Loans Held For Sale [Member]
Financial Assets:
Carrying Amount	3,857	349
Estimated Fair Value	3,857	349
Loans Receivable [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	955,516
Loans Receivable [Member]
Financial Assets:
Carrying Amount	966,508	962,890
Estimated Fair Value	955,516	944,756
Accrued Interest Receivables [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	4,377
Accrued Interest Receivables [Member]
Financial Assets:
Carrying Amount	4,377	4,531
Estimated Fair Value	$ 4,377	$ 4,531