Note 22 - Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure Text Block [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

	As of December 31, 2014										As of December 31, 2013
	Company					Bank					Company					Bank
	Balance		Percentage			Balance		Percentage			Balance		Percentage			Balance		Percentage
	(Dollars in thousands)
Tier I Capital (to risk- weighted assets)	$	1,406,511		14.96	%	$	1,353,481		14.42	%	$	1,288,892		15.04	%	$	1,244,480		14.53	%
Tier I Capital minimum requirement		376,072		4.00			375,318		4.00			342,899		4.00			342,701		4.00
Excess	$	1,030,439		10.96	%	$	978,163		10.42	%	$	945,993		11.04	%	$	901,779		10.53	%
Total Capital (to risk- weighted assets)	$	1,524,702		16.22	%	$	1,471,337		15.68	%	$	1,401,319		16.35	%	$	1,352,415		15.79	%
Total Capital minimum requirement		752,144		8.00			750,637		8.00			685,799		8.00			685,402		8.00
Excess	$	772,558		8.22	%	$	720,700		7.68	%	$	715,520		8.35	%	$	667,013		7.79	%
Tier I Capital (to average assets) Leverage ratio	$	1,406,511		12.99	%	$	1,353,481		12.52	%	$	1,288,892		12.48	%	$	1,244,480		12.06	%
Minimum leverage requirement		433,121		4.00			432,350		4.00			413,158		4.00			412,815		4.00
Excess	$	973,390		8.99	%	$	921,131		8.52	%	$	875,734		8.48	%	$	831,665		8.06	%
Total average assets (1)	$	10,828,015				$	10,808,747				$	10,328,952				$	10,320,368
Risk-weighted assets	$	9,401,803				$	9,382,961				$	8,572,487				$	8,567,523