Securities (Tables)

3 Months Ended

Mar. 31, 2013

Investment Securities [Abstract]

Schedule of securities sales activity with realized gains and losses derived using specific identification method

	Three Months Ended
	March 31,
	2013		2012
Proceeds from sales	$	15,751	$	105,111
Gross gains on sales	$	116	$	557
Gross losses on sales		—		—
Net gains on sales of securities	$	116	$	557
Income tax expense attributable to sales	$	45	$	217

Schedule of amortized cost, gross unrealized gains and losses and fair value of securities held to maturity

			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
As of March 31, 2013	Cost		Gains		Losses		Value
State and political subdivisions	$	51,768	$	5,663	$	—	$	57,431
Mortgage-backed securities (1)		179,319		10,388		51		189,656
Total	$	231,087	$	16,051	$	51	$	247,087
As of December 31, 2012
State and political subdivisions	$	51,780	$	5,486	$	—	$	57,266
Mortgage-backed securities (1)		192,404		11,461		—		203,865
Total	$	244,184	$	16,947	$	—	$	261,131
As of March 31, 2012
State and political subdivisions	$	51,893	$	4,413	$	—	$	56,306
Mortgage-backed securities (1)		251,743		10,441		—		262,184
Total	$	303,636	$	14,854	$	—	$	318,490
(1)All are residential type mortgage-backed securities

Schedule of cost basis, unrealized gains and losses, and fair value of securities available for sale

			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
As of March 31, 2013	Cost		Gains		Losses		Value
State and political subdivisions	$	22,711	$	1,330	$	4	$	24,037
Mortgage-backed securities (1)		1,450,645		21,210		3,544		1,468,311
Corporate bonds		190,843		2,035		4,084		188,794
Asset-backed securities		223,827		2,420		377		225,870
Other		2,414		—		—		2,414
Total	$	1,890,440	$	26,995	$	8,009	$	1,909,426
As of December 31, 2012
State and political subdivisions	$	27,717	$	1,354	$	19	$	29,052
Mortgage-backed securities (1)		1,408,042		22,552		2,092		1,428,502
Corporate bonds		169,783		1,052		7,173		163,662
Asset-backed securities		209,411		1,894		749		210,556
Other		2,821		—		—		2,821
Total	$	1,817,774	$	26,852	$	10,033	$	1,834,593
As of March 31, 2012
U.S. Government agencies	$	43,593	$	286	$	90	$	43,789
State and political subdivisions		21,490		1,321		3		22,808
Mortgage-backed securities (1)		1,692,446		33,212		590		1,725,068
Corporate bonds		119,154		—		14,568		104,586
Other		2,564		—		—		2,564
Total	$	1,879,247	$	34,819	$	15,251	$	1,898,815
(1)      All are residential type mortgage-backed securities

Schedule of held to maturity securities in an unrealized loss position

	Less than 12 Months				12 Months or More				Total
			Unrealized				Unrealized				Unrealized
As of March 31, 2013	Fair Value		Loss		Fair Value		Loss		Fair Value		Loss
Mortgage-backed securities	$	4,929	$	51	$	—	$	—		4,929		51
Total unrealized loss position	$	4,929	$	51	$	—	$	—	$	4,929	$	51

Schedule of available for sale securities in an unrealized loss position

	Less than 12 Months				12 Months or More				Total
			Unrealized				Unrealized				Unrealized
As of March 31, 2013	Fair Value		Loss		Fair Value		Loss		Fair Value		Loss
State and political subdivisions	$	1,185	$	2	$	10	$	2	$	1,195	$	4
Mortgage-backed securities		399,263		3,544		—		—		399,263		3,544
Corporate bonds		21,323		145		77,007		3,939		98,330		4,084
Asset-backed securities		72,064		377		—		—		72,064		377
Total unrealized loss position	$	493,835	$	4,068	$	77,017	$	3,941	$	570,852	$	8,009
As of December 31, 2012
State and political subdivisions	$	3,674	$	17	$	10	$	2	$	3,684	$	19
Mortgage-backed securities		326,485		2,092		—		—		326,485		2,092
Corporate bonds		21,248		136		93,903		7,037		115,151		7,173
Asset-backed securities		82,188		749		—		—		82,188		749
Total unrealized loss position	$	433,595	$	2,994	$	93,913	$	7,039	$	527,508	$	10,033
As of March 31, 2012
U.S. Government agencies	$	9,905	$	90	$	—	$	—	$	9,905	$	90
State and political subdivisions		—		—		11		3		11		3
Mortgage-backed securities		405,039		574		21,067		16		426,106		590
Corporate bonds		35,306		2,872		69,230		11,696		104,536		14,568
Total unrealized loss position	$	450,250	$	3,536	$	90,308	$	11,715	$	540,558	$	15,251

Schedule of amortized cost and fair value of held to maturity and available for sale securities by contractual maturity

	Available-for-Sale				Held-to-Maturity
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
State and political subdivisions:
Within 1 year	$	996	$	1,005	$	—	$	—
1 to 5 years		14,552		15,453		9,858		10,672
5 to 10 years		6,316		6,658		26,481		29,490
More than 10 years		847		921		15,429		17,269
		22,711		24,037		51,768		57,431
Corporate bonds:
1 to 5 years		38,123		38,503		—		—
5 to 10 years		141,961		140,119		—		—
More than 10 years		10,759		10,172		—		—
		190,843		188,794		—		—
Asset-backed securities:
1 to 5 years		32,384		32,405		—		—
5 to 10 years		142,507		143,693		—		—
More than 10 years		48,936		49,772		—		—
		223,827		225,870		—		—
Other:
More than 10 years		2,414		2,414		—		—
		2,414		2,414		—		—
Total securities other than mortgage-backed securities:
Within 1 year		996		1,005		—		—
1 to 5 years		85,059		86,361		9,858		10,672
5 to 10 years		290,784		290,470		26,481		29,490
More than 10 years		62,956		63,279		15,429		17,269
Mortgage-backed securities		1,450,645		1,468,311		179,319		189,656
	$	1,890,440	$	1,909,426	$	231,087	$	247,087