Fair Value (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value [Abstract]

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

	June 30, 2016
(in thousands)	Level 1		Level 2		Total
Assets
Available for sale debt securities:
U.S. Treasury and government agency securities	$	—	$	116	$	116
Municipal obligations		—		156,292		156,292
Corporate debt securities		—		3,500		3,500
Mortgage-backed securities		—		1,906,346		1,906,346
Collateralized mortgage obligations		—		241,346		241,346
Equity securities		1,212		—		1,212
Total available for sale securities		1,212		2,307,600		2,308,812
Derivative assets (1)		—		43,903		43,903
Total recurring fair value measurements - assets	$	1,212	$	2,351,503	$	2,352,715
Liabilities
Derivative liabilities (1)	$	—	$	43,184	$	43,184
Total recurring fair value measurements - liabilities	$	—	$	43,184	$	43,184

(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

	June 30, 2016
(in thousands)	Level 1		Level 2		Level 3		Total
Collateral-dependent impaired loans	$	—	$	116,516	$	—	$	116,516
Other real estate owned		—		—		14,053		14,053
Total nonrecurring fair value measurements	$	—	$	116,516	$	14,053	$	130,569

	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

	June 30, 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	$	466,587	$	—	$	—	$	466,587	$	466,587
Available for sale securities		1,212		2,307,600		—		2,308,812		2,308,812
Held to maturity securities		—		2,569,084		—		2,569,084		2,497,558
Loans, net		—		116,516		16,058,354		16,174,870		15,809,710
Loans held for sale		—		42,297		—		42,297		42,297
Derivative financial instruments		—		43,903		—		43,903		43,903
Financial liabilities:
Deposits	$	—	$	—	$	18,837,146	$	18,837,146	$	18,816,869
Federal funds purchased		10,575		—		—		10,575		10,575
Securities sold under  agreements to repurchase		409,532		—		—		409,532		409,532
FHLB borrowings		675,000		—		—		675,000		675,000
Long-term debt		—		474,888		—		474,888		468,028
Derivative financial instruments		—		43,184		—		43,184		43,184

	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