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Bank subsidiary (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Available-for-sale securities
Total available-for-sale securities, Amortized cost	$ 522,280	$ 535,090
Gross unrealized gains	5,258	6,911
Gross unrealized losses	(10,004)	(12,994)
Available-for-sale securities	517,534	529,007
Available-for-sale Securities, Continuous Unrealized Loss Position
Fair value, less than 12 months	274,367	313,800
Gross unrealized losses, less than 12 months	(7,315)	(11,353)
Fair value, 12 months or longer	53,949	19,655
Gross unrealized losses, 12 months or longer	(2,689)	(1,641)
Federal agency obligations
Available-for-sale securities
Total available-for-sale securities, Amortized cost	87,916	83,193
Gross unrealized gains	489	174
Gross unrealized losses	(1,885)	(2,394)
Available-for-sale securities	86,520	80,973
Available-for-sale Securities, Continuous Unrealized Loss Position
Fair value, less than 12 months	44,700	70,779
Gross unrealized losses, less than 12 months	(1,508)	(2,394)
Fair value, 12 months or longer	4,402	0
Gross unrealized losses, 12 months or longer	(377)	0
Mortgage-related securities - FNMA, FHLMC and GNMA
Available-for-sale securities
Total available-for-sale securities, Amortized cost	434,364	374,993
Gross unrealized gains	4,769	4,911
Gross unrealized losses	(8,119)	(10,460)
Available-for-sale securities	431,014	369,444
Available-for-sale Securities, Continuous Unrealized Loss Position
Fair value, less than 12 months	229,667	228,543
Gross unrealized losses, less than 12 months	(5,807)	(8,819)
Fair value, 12 months or longer	49,547	19,655
Gross unrealized losses, 12 months or longer	(2,312)	(1,641)
Municipal bonds
Available-for-sale securities
Total available-for-sale securities, Amortized cost	0	76,904
Gross unrealized gains	0	1,826
Gross unrealized losses	0	(140)
Available-for-sale securities	0	78,590
Available-for-sale Securities, Continuous Unrealized Loss Position
Fair value, less than 12 months	0	14,478
Gross unrealized losses, less than 12 months	0	(140)
Fair value, 12 months or longer	0	0
Gross unrealized losses, 12 months or longer	$ 0	$ 0

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer.

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