Note 5 - Fair Value (Detail) - Financial Instruments (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financial Assets:
Carrying Amount	$ 1,482,110	$ 1,485,299
Financial Liabilities:
Carrying Amount	1,336,021	1,329,922
Non-interest Bearing Deposits [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Liabilities:
Estimated Fair Value	(229,437)
Non-interest Bearing Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Liabilities:
Estimated Fair Value	0
Non-interest Bearing Deposits [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Liabilities:
Estimated Fair Value	0
Non-interest Bearing Deposits [Member]
Financial Liabilities:
Carrying Amount	(229,437)	(214,904)
Estimated Fair Value	(229,437)	(214,904)
Interest Bearing Deposit Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Liabilities:
Estimated Fair Value	0
Interest Bearing Deposit Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Liabilities:
Estimated Fair Value	0
Interest Bearing Deposit Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Liabilities:
Estimated Fair Value	(998,015)
Interest Bearing Deposit Liabilities [Member]
Financial Liabilities:
Carrying Amount	(995,424)	(1,005,638)
Estimated Fair Value	(998,015)	(1,000,580)
Securities Loaned or Sold under Agreements to Repurchase [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Liabilities:
Estimated Fair Value	0
Securities Loaned or Sold under Agreements to Repurchase [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Liabilities:
Estimated Fair Value	(45,927)
Securities Loaned or Sold under Agreements to Repurchase [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Liabilities:
Estimated Fair Value	0
Securities Loaned or Sold under Agreements to Repurchase [Member]
Financial Liabilities:
Carrying Amount	(45,927)	(46,784)
Estimated Fair Value	(45,927)	(46,784)
Federal Home Loan Bank Advance [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Liabilities:
Estimated Fair Value	0
Federal Home Loan Bank Advance [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Liabilities:
Estimated Fair Value	0
Federal Home Loan Bank Advance [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Liabilities:
Estimated Fair Value	(21,275)
Federal Home Loan Bank Advance [Member]
Financial Liabilities:
Carrying Amount	(19,558)	(19,457)
Estimated Fair Value	(21,275)	(21,359)
Subordinated Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Liabilities:
Estimated Fair Value	0
Subordinated Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Liabilities:
Estimated Fair Value	0
Subordinated Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Liabilities:
Estimated Fair Value	(36,102)
Subordinated Debt Obligations [Member]
Financial Liabilities:
Carrying Amount	(36,084)	(36,084)
Estimated Fair Value	(36,102)	(36,488)
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	71,975
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	0
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	0
Cash and Cash Equivalents [Member]
Financial Assets:
Carrying Amount	71,975	75,816
Estimated Fair Value	71,975	75,816
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	2,927
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	0
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	0
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	2
Trading Account Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	0
Trading Account Assets [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	0
Trading Account Assets [Member]
Financial Assets:
Carrying Amount	2	2
Estimated Fair Value	2	2
Securities Available For Sale [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	39
Securities Available For Sale [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	333,489
Securities Available For Sale [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	16,701
Securities Available For Sale [Member]
Financial Assets:
Carrying Amount	350,229	342,184
Estimated Fair Value	350,229	342,184
Federal Home Loan Bank Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	0
Federal Home Loan Bank Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	0
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 1 [Member]
Financial Assets:
Estimated Fair Value	0
Loans Held For Sale [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	3,813
Loans Held For Sale [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	0
Loans Held For Sale [Member]
Financial Assets:
Carrying Amount	3,813	349
Estimated Fair Value	3,813	349
Loans Receivable [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	0
Loans Receivable [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	0
Loans Receivable [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	944,191
Loans Receivable [Member]
Financial Assets:
Carrying Amount	956,078	962,890
Estimated Fair Value	$ 944,191	$ 944,756