Fair Value (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value [Abstract]

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

	March 31, 2016
(in thousands)	Level 1		Level 2		Total
Assets
Available for sale debt securities:
U.S. Treasury and government agency securities	$	—	$	125	$	125
Municipal obligations		—		87,939		87,939
Corporate debt securities		—		3,500		3,500
Mortgage-backed securities		—		1,765,974		1,765,974
Collateralized mortgage obligations		—		289,166		289,166
Equity securities		2,762		—		2,762
Total available for sale securities		2,762		2,146,704		2,149,466
Derivative assets (1)		—		36,479		36,479
Total recurring fair value measurements - assets	$	2,762	$	2,183,183	$	2,185,945
Liabilities
Derivative liabilities (1)	$	—	$	36,336	$	36,336
Total recurring fair value measurements - liabilities	$	—	$	36,336	$	36,336

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

	December 31, 2015
(in thousands)	Level 1		Level 2		Total
Assets
Available for sale debt securities:
U.S. Treasury and government agency securities	$	—	$	134	$	134
Municipal obligations		—		39,607		39,607
Corporate debt securities		—		3,500		3,500
Mortgage-backed securities		—		1,758,373		1,758,373
Collateralized mortgage obligations		—		289,033		289,033
Equity securities		2,757		—		2,757
Total available for sale securities		2,757		2,090,647		2,093,404
Derivative assets (1)		—		23,251		23,251
Total recurring fair value measurements - assets	$	2,757	$	2,113,898	$	2,116,655
Liabilities
Derivative liabilities (1)	$	—	$	23,968	$	23,968
Total recurring fair value measurements - liabilities	$	—	$	23,968	$	23,968

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

Financial Assets Measured at Fair Value on Nonrecurring Basis

	March 31, 2016
(in thousands)	Level 1		Level 2		Level 3		Total
Collateral-dependent impaired loans	$	—	$	179,627	$	—	$	179,627
Other real estate owned		—		—		14,508		14,508
Total nonrecurring fair value measurements	$	—	$	179,627	$	14,508	$	194,135

	December 31, 2015
(in thousands)	Level 1		Level 2		Level 3		Total
Collateral-dependent impaired loans	$	—	$	93,602	$	—	$	93,602
Other real estate owned		—		—		17,206		17,206
Total nonrecurring fair value measurements	$	—	$	93,602	$	17,206	$	110,808

Estimated Fair Values of Financial Instruments

	March 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	$	442,650	$	—	$	—	$	442,650	$	442,650
Available for sale securities		2,762		2,146,704		—		2,149,466		2,149,466
Held to maturity securities		—		2,566,799		—		2,566,799		2,518,371
Loans, net		—		179,627		15,761,305		15,940,932		15,760,330
Loans held for sale		—		24,001		—		24,001		24,001
Derivative financial instruments		—		36,479		—		36,479		36,479
Financial liabilities:
Deposits	$	—	$	—	$	18,651,845	$	18,651,845	$	18,656,150
Federal funds purchased		6,825		—		—		6,825		6,825
Securities sold under  agreements to repurchase		418,962		—		—		418,962		418,962
FHLB borrowings		675,000		—		—		675,000		675,000
Long-term debt		—		476,530		—		476,530		471,245
Derivative financial instruments		—		36,336		—		36,336		36,336

	December 31, 2015
							Total Fair		Carrying
(in thousands)	Level 1		Level 2		Level 3		Value		Amount
Financial assets:
Cash, interest-bearing bank deposits, and federal funds sold	$	869,429	$	—	$	—	$	869,429	$	869,429
Available for sale securities		2,757		2,090,647		—		2,093,404		2,093,404
Held to maturity securities		—		2,375,851		—		2,375,851		2,370,388
Loans, net		—		93,602		15,334,201		15,427,803		15,522,135
Loans held for sale		—		20,434		—		20,434		20,434
Derivative financial instruments		—		23,251		—		23,251		23,251
Financial liabilities:
Deposits	$	—	$	—	$	18,327,425	$	18,327,425	$	18,348,912
Federal funds purchased		10,100		—		—		10,100		10,100
Securities sold under  agreements to repurchase		513,544		—		—		513,544		513,544
FHLB borrowings		900,000		—		—		900,000		900,000
Long-term debt		—		488,711		—		488,711		490,145
Derivative financial instruments		—		23,968		—		23,968		23,968