Fair Value (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value [Abstract]

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

	March 31, 2017
(in thousands)	Level 1		Level 2		Level 3		Total
Assets
Available for sale debt securities:
U.S. Treasury and government agency securities	$	—	$	74,496	$	—	$	74,496
Municipal obligations		—		241,036		—		241,036
Corporate debt securities		—		3,500		—		3,500
Residential mortgage-backed securities		—		1,559,417		—		1,559,417
Commercial mortgage-backed securities		—		428,048		—		428,048
Collateralized mortgage obligations		—		192,264		—		192,264
Total available for sale securities		—		2,498,761		—		2,498,761
Derivative assets (1)		—		14,959		—		14,959
Total recurring fair value measurements - assets	$	—	$	2,513,720	$	—	$	2,513,720
Liabilities
Derivative liabilities (1)	$	—	$	12,877	$	—	$	12,877
Total recurring fair value measurements - liabilities	$	—	$	12,877	$	—	$	12,877

(1) For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.

	December 31, 2016
(in thousands)	Level 1		Level 2		Level 3		Total
Assets
Available for sale debt securities:
U.S. Treasury and government agency securities	$	—	$	54,828	$	—	$	54,828
Municipal obligations		—		242,155		—		242,155
Corporate debt securities		—		3,500		—		3,500
Residential mortgage-backed securities		—		1,611,355		—		1,611,355
Commercial mortgage-backed securities		—		402,591		—		402,591
Collateralized mortgage obligations		—		202,479		—		202,479
Total available for sale securities		—		2,516,908		—		2,516,908
Derivative assets (1)		—		20,315		—		20,315
Total recurring fair value measurements - assets	$	—	$	2,537,223	$	—	$	2,537,223
Liabilities
Derivative liabilities (1)	$	—	$	27,432	$	—	$	27,432
Total recurring fair value measurements - liabilities	$	—	$	27,432	$	—	$	27,432

(1) For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.

Financial Assets Measured at Fair Value on Nonrecurring Basis

	March 31, 2017
(in thousands)	Level 1		Level 2		Level 3		Total
Collateral-dependent impaired loans	$	—	$	143,327	$	—	$	143,327
Other real estate owned		—		—		9,295		9,295
Total nonrecurring fair value measurements	$	—	$	143,327	$	9,295	$	152,622

	December 31, 2016
(in thousands)	Level 1		Level 2		Level 3		Total
Collateral-dependent impaired loans	$	—	$	169,888	$	—	$	169,888
Other real estate owned		—		—		13,968		13,968
Total nonrecurring fair value measurements	$	—	$	169,888	$	13,968	$	183,856

Estimated Fair Values of Financial Instruments

	March 31, 2017
							Total Fair		Carrying
(in thousands)	Level 1		Level 2		Level 3		Value		Amount
Financial assets:
Cash, interest-bearing bank deposits, and federal funds sold	$	384,587	$	—	$	—	$	384,587	$	384,587
Available for sale securities		—		2,498,761		—		2,498,761		2,498,761
Held to maturity securities		—		2,477,420		—		2,477,420		2,502,512
Loans, net		—		143,327		17,580,123		17,723,450		17,991,318
Loans held for sale		—		20,883		—		20,883		20,883
Derivative financial instruments		—		14,959		—		14,959		14,959
Financial liabilities:
Deposits	$	—	$	—	$	19,927,363	$	19,927,363	$	19,922,020
Federal funds purchased		16,321		—		—		16,321		16,321
Securities sold under  agreements to repurchase		444,788		—		—		444,788		444,788
FHLB short-term borrowings		1,660,823		—		—		1,660,823		1,660,823
Long-term debt		—		524,039		—		524,039		525,082
Derivative financial instruments		—		12,877		—		12,877		12,877

	December 31, 2016
							Total Fair		Carrying
(in thousands)	Level 1		Level 2		Level 3		Value		Amount
Financial assets:
Cash, interest-bearing bank deposits, and federal funds sold	$	450,866	$	—	$	—	$	450,866	$	450,866
Available for sale securities		—		2,516,908		—		2,516,908		2,516,908
Held to maturity securities		—		2,470,117		—		2,470,117		2,500,220
Loans, net		—		169,888		16,326,961		16,496,849		16,522,733
Loans held for sale		—		34,064		—		34,064		34,064
Derivative financial instruments		—		20,315		—		20,315		20,315
Financial liabilities:
Deposits	$	—	$	—	$	19,430,939	$	19,430,939	$	19,424,266
Federal funds purchased		2,275		—		—		2,275		2,275
Securities sold under  agreements to repurchase		358,131		—		—		358,131		358,131
FHLB short-term borrowings		865,000		—		—		865,000		865,000
Long-term debt		—		435,747		—		435,747		436,280
Derivative financial instruments		—		27,432		—		27,432		27,432