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Note 11 - Deposits (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure Text Block [Abstract]

Deposit Composition And Interest Rate [Table Text Block]

		2015								2014								2013
(dollars in thousands)						Average								Average								Average
		Balance				Rate				Balance				Rate				Balance				Rate
Noninterest bearing demand		$	1,405,067				-			$	1,175,799				-			$	849,409				-
Interest bearing transaction			178,797				0.16	%			143,628				0.13	%			118,580				0.26	%
Savings and money market			2,835,325				0.34	%			2,302,600				0.32	%			1,811,088				0.35	%
Time, $100,000 or more			406,570				0.77	%			393,132				0.68	%			203,706				0.88	%
Other time			332,685				0.74	%			295,609				0.70	%			242,631				0.54	%
Total		$	5,158,444							$	4,310,768							$	3,225,414

Investments Classified by Contractual Maturity Date [Table Text Block]

(dollars in thousands)		2015				2014				2013
Three months or less		$	88,483			$	104,482			$	82,790
More than three months through six months			123,789				106,861				109,101
More than six months through twelve months			234,684				182,187				118,646
Over twelve months			292,299				295,211				135,800
Total		$	739,255			$	688,741			$	446,337

Interest Expense On Deposits [Table Text Block]

(dollars in thousands)		2015				2014				2013
Interest bearing transaction		$	291			$	178			$	298
Savings and money market			8,185				6,265				5,765
Time, $100,000 or more			5,019				2,830				2,080
Other time			848				365				2,471
Total		$	14,343			$	9,638			$	10,614