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Note 9 - Deposits (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure Text Block [Abstract]

Deposit Composition and Interest Rate [Table Text Block]

		2014								2013								2012
(dollars in thousands)		Balance				Average Rate				Balance				Average Rate				Balance				Average Rate
Noninterest bearing demand		$	1,175,799				-			$	849,409				-			$	881,390				-
Interest bearing transaction			143,628				0.13	%			118,580				0.26	%			113,813				0.34	%
Savings and money market			2,302,600				0.32	%			1,811,088				0.35	%			1,374,869				0.48	%
Time, $100,000 or more			393,132				0.68	%			203,706				0.88	%			232,875				1.12	%
Other time			295,609				0.70	%			242,631				0.54	%			294,275				0.71	%
Total		$	4,310,768							$	3,225,414							$	2,897,222

Investments Classified by Contractual Maturity Date [Table Text Block]

(dollars in thousands)		2014				2013				2012
Three months or less		$	104,482			$	82,790			$	102,022
More than three months through six months			106,861				109,101				88,156
More than six months through twelve months			182,187				118,646				104,122
Over twelve months			295,211				135,800				232,850
Total		$	688,741			$	446,337			$	527,150

Interest Expense on Deposits [Table Text Block]

(dollars in thousands)		2014				2013				2012
Interest bearing transaction		$	178			$	298			$	289
Savings and money market			6,265				5,765				5,946
Time, $100,000 or more			2,830				2,080				2,729
Other time			365				2,471				3,093
Total		$	9,638			$	10,614			$	12,057