Note 4 - Fair Value (Detail) - Financial Instruments (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financial Assets:
Carrying Amount	$ 1,515,503	$ 1,498,762
Financial Liabilities:
Carrying Amount	1,366,136	1,351,704
Interest Bearing Deposit Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Liabilities:
Estimated Fair Value	0	0
Interest Bearing Deposit Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Liabilities:
Estimated Fair Value	0	0
Interest Bearing Deposit Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Liabilities:
Estimated Fair Value	(1,256,668)	(1,243,712)
Interest Bearing Deposit Liabilities [Member]
Financial Liabilities:
Carrying Amount	(1,256,878)	(1,241,401)
Estimated Fair Value	(1,256,668)	(1,243,712)
Securities Loaned or Sold under Agreements to Repurchase [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Liabilities:
Estimated Fair Value	0	0
Securities Loaned or Sold under Agreements to Repurchase [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Liabilities:
Estimated Fair Value	(43,065)	(42,785)
Securities Loaned or Sold under Agreements to Repurchase [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Liabilities:
Estimated Fair Value	0	0
Securities Loaned or Sold under Agreements to Repurchase [Member]
Financial Liabilities:
Carrying Amount	(43,065)	(42,785)
Estimated Fair Value	(43,065)	(42,785)
Federal Home Loan Bank Advance [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Liabilities:
Estimated Fair Value	0	0
Federal Home Loan Bank Advance [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Liabilities:
Estimated Fair Value	0	0
Federal Home Loan Bank Advance [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Liabilities:
Estimated Fair Value	(21,513)	(24,122)
Federal Home Loan Bank Advance [Member]
Financial Liabilities:
Carrying Amount	(19,959)	(22,493)
Estimated Fair Value	(21,513)	(24,122)
Subordinated Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Liabilities:
Estimated Fair Value	0	0
Subordinated Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Liabilities:
Estimated Fair Value	0	0
Subordinated Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Liabilities:
Estimated Fair Value	(36,094)	(36,093)
Subordinated Debt Obligations [Member]
Financial Liabilities:
Carrying Amount	(36,084)	(36,084)
Estimated Fair Value	(36,094)	(36,093)
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	110,767	99,601
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	0	0
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	0	0
Cash and Cash Equivalents [Member]
Financial Assets:
Carrying Amount	110,767	99,601
Estimated Fair Value	110,767	99,601
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	2,927	2,927
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	0	0
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	0	0
Certificates of Deposit [Member]
Financial Assets:
Carrying Amount	2,927	2,927
Estimated Fair Value	2,927	2,927
Trading Account Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	6	6
Trading Account Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	0	0
Trading Account Assets [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	0	0
Trading Account Assets [Member]
Financial Assets:
Carrying Amount	6	6
Estimated Fair Value	6	6
Securities Available For Sale [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	97	91
Securities Available For Sale [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	338,804	331,717
Securities Available For Sale [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	22,035	21,870
Securities Available For Sale [Member]
Financial Assets:
Carrying Amount	360,936	353,678
Estimated Fair Value	360,936	353,678
Federal Home Loan Bank Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	0	0
Federal Home Loan Bank Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	0	0
Federal Home Loan Bank Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	7,266	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	0
Loans Held For Sale [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	3,022	2,921
Loans Held For Sale [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	0	0
Loans Held For Sale [Member]
Financial Assets:
Carrying Amount	3,022	2,921
Estimated Fair Value	3,022	2,921
Loans Receivable [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Estimated Fair Value	0	0
Loans Receivable [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Estimated Fair Value	0	0
Loans Receivable [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Estimated Fair Value	922,570	930,354
Loans Receivable [Member]
Financial Assets:
Carrying Amount	940,470	942,422
Estimated Fair Value	$ 922,570	$ 930,354