INVESTMENTS IN DEBT AND EQUITY SECURITIES (Tables)

3 Months Ended

Mar. 31, 2013

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities [Table Text Block]

The amortized cost, contractual maturity, gross unrealized gains and losses and fair value of investment securities available for sale at March 31, 2013 and December 31, 2012 were as follows:

	Maturity									Total Amortized Cost	Gross				Weighted Average Yield
	1 Year			1-5		5-10		After			Unrealized			Fair
	or Less			Years		Years		10 Years			Gains	Losses		Value
	(dollars expressed in thousands)
March 31, 2013:
Carrying value:
U.S. Government sponsored agencies	$	10,007		69,866		—		227,485		307,358	4,258	(2,157	)	309,459	1.40	%
Residential mortgage-backed	192			34,100		147,875		1,066,252		1,248,419	32,490	(392	)	1,280,517	2.29
Commercial mortgage-backed	—			—		802		—		802	100	—		902	4.53
State and political subdivisions	1,168			3,224		201		28,478		33,071	155	—		33,226	1.40
Corporate notes	—			140,218		49,720		—		189,938	7,331	(374	)	196,895	3.02
Equity investments	—			—		—		1,500		1,500	16	—		1,516	2.40
Total	$	11,367		247,408		198,598		1,323,715		1,781,088	44,350	(2,923	)	1,822,515	2.20
Fair value:
Debt securities	$	11,398		254,989		203,260		1,351,352
Equity securities	—			—		—		1,516
Total	$	11,398		254,989		203,260		1,352,868
Weighted average yield	2.02		%	2.14	%	2.31	%	2.19	%
December 31, 2012:
Carrying value:
U.S. Government sponsored agencies	$	10,051		80,328		—		213,892		304,271	6,304	(146	)	310,429	1.42	%
Residential mortgage-backed	364			24,014		219,286		1,251,917		1,495,581	38,983	(497	)	1,534,067	2.32
Commercial mortgage-backed	—			—		806		—		806	109	—		915	4.86
State and political subdivisions	985			3,579		201		—		4,765	164	—		4,929	4.05
Corporate notes	—			137,090		49,704		—		186,794	6,192	(621	)	192,365	3.13
Equity investments	—			—		—		1,000		1,000	22	—		1,022	2.54
Total	$	11,400		245,011		269,997		1,466,809		1,993,217	51,774	(1,264	)	2,043,727	2.26
Fair value:
Debt securities	$	11,476		251,558		275,251		1,504,420
Equity securities	—			—		—		1,022
Total	$	11,476		251,558		275,251		1,505,442
Weighted average yield	2.01		%	2.17	%	2.65	%	2.21	%

Held-to-maturity Securities [Table Text Block]

The amortized cost, contractual maturity, gross unrealized gains and losses and fair value of investment securities held to maturity at March 31, 2013 and December 31, 2012 were as follows:

	Maturity									Total Amortized Cost	Gross				Weighted Average Yield
	1 Year			1-5		5-10		After			Unrealized			Fair
	or Less			Years		Years		10 Years			Gains	Losses		Value
	(dollars expressed in thousands)
March 31, 2013:
Carrying value:
U.S. Government sponsored agencies	$	—		—		27,656		—		27,656	133	—		27,789	1.43	%
Residential mortgage-backed	—			—		212,152		595,938		808,090	5,369	(620	)	812,839	1.74
State and political subdivisions	1,022			1,099		55		1,104		3,280	24	—		3,304	2.12
Total	$	1,022		1,099		239,863		597,042		839,026	5,526	(620	)	843,932	1.73
Fair value:
Debt securities	$	1,036		1,107		242,412		599,377
Weighted average yield	2.92		%	3.40	%	1.45	%	1.84	%
December 31, 2012:
Carrying value:
U.S. Government sponsored agencies	$	—		—		52,582		—		52,582	269	—		52,851	1.63	%
Residential mortgage-backed	—			—		108,420		466,863		575,283	6,142	(614	)	580,811	1.82
State and political subdivisions	826			1,099		252		1,511		3,688	51	(377	)	3,362	1.89
Total	$	826		1,099		161,254		468,374		631,553	6,462	(991	)	637,024	1.80
Fair value:
Debt securities	$	836		1,129		164,433		470,626
Weighted average yield	2.56		%	3.40	%	1.77	%	1.81	%

Schedule of Realized Gain (Loss) [Table Text Block]

Gross realized gains and gross realized losses on investment securities for the three months ended March 31, 2013 and 2012 were as follows:

	Three Months Ended
	March 31,
	2013			2012
	(dollars expressed in thousands)
Gross realized gains on sales of available-for-sale securities	$	346		522
Gross realized losses on sales of available-for-sale securities	(354		)	—
Other-than-temporary impairment	(408		)	—
Net realized (loss) gain on investment securities	$	(416	)	522

Schedule of Unrealized Loss on Investments [Table Text Block]

Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at March 31, 2013 and December 31, 2012 were as follows:

	Less Than 12 Months				12 Months or More			Total
	Fair Value		Unrealized Losses		Fair Value	Unrealized Losses		Fair Value	Unrealized Losses
	(dollars expressed in thousands)
March 31, 2013:
Available for sale:
U.S. Government sponsored agencies	$	46,855	(2,157	)	—	—		46,855	(2,157	)
Residential mortgage-backed	49,531		(315	)	5,418	(77	)	54,949	(392	)
Corporate notes	12,625		(277	)	10,007	(97	)	22,632	(374	)
Total	$	109,011	(2,749	)	15,425	(174	)	124,436	(2,923	)
Held to maturity:
Residential mortgage-backed	$	217,426	(620	)	—	—		217,426	(620	)
Total	$	217,426	(620	)	—	—		217,426	(620	)
December 31, 2012:
Available for sale:
U.S. Government sponsored agencies	$	20,018	(146	)	—	—		20,018	(146	)
Residential mortgage-backed	125,449		(441	)	270	(56	)	125,719	(497	)
Corporate notes	—		—		17,675	(621	)	17,675	(621	)
Total	$	145,467	(587	)	17,945	(677	)	163,412	(1,264	)
Held to maturity:
Residential mortgage-backed	$	66,011	(614	)	—	—		66,011	(614	)
State and political subdivisions	1,133		(377	)	—	—		1,133	(377	)
Total	$	67,144	(991	)	—	—		67,144	(991	)