Loans and Allowance for Loan Losses (Tables)

3 Months Ended

Mar. 31, 2017

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans, Net of Unearned Income

	March 31,		December 31,
(in thousands)	2017		2016
Commercial non-real estate	$	8,074,287	$	7,613,917
Commercial real estate - owner occupied		2,047,451		1,906,821
Total commercial & industrial		10,121,738		9,520,738
Commercial real estate - income producing		2,505,104		2,013,890
Construction and land development		1,252,667		1,010,879
Residential mortgages		2,266,263		2,146,713
Consumer		2,059,096		2,059,931
Total loans	$	18,204,868	$	16,752,151

Allowance for Loan Losses by Portfolio Class

			Commercial				Commercial
	Commercial		real estate-		Total		real estate-		Construction
		non-real	owner		commercial &		income		and land		Residential
(in thousands)	estate		occupied		industrial		producing		development		mortgages		Consumer		Total
	Three months ended March 31, 2017
Allowance for loan  losses:
Beginning balance	$	147,052	$	11,083	$	158,135	$	13,509	$	6,271	$	25,361	$	26,142	$	229,418
Purchased credit impaired activity:
Charge-offs		—		—		—		—		(54)		(59)		(139)		(252)
Recoveries		2		75		77		—		23		5		29		134
Net provision for loan losses		(46)		(182)		(228)		(40)		(92)		(7)		(39)		(406)
Decrease in FDIC loss share receivable		(31)		—		(31)		—		—		(1,696)		(103)		(1,830)
Non-purchased credit impaired activity:
Charge-offs		(24,791)		(29)		(24,820)		(7)		(37)		(289)		(8,539)		(33,692)
Recoveries		936		200		1,136		375		448		108		1,714		3,781
Net provision for loan losses		8,147		375		8,522		(226)		161		383		7,557		16,397
Ending balance	$	131,269	$	11,522	$	142,791	$	13,611	$	6,720	$	23,806	$	26,622	$	213,550
Ending balance:
Allowance:
Individually evaluated for impairment	$	15,017	$	76	$	15,093	$	1,114	$	1	$	94	$	199	$	16,501
Amounts related to purchased credit impaired loans		411		787		1,198		213		283		13,286		1,019		15,999
Collectively evaluated for impairment		115,841		10,659		126,500		12,284		6,436		10,426		25,404		181,050
Total allowance	$	131,269	$	11,522	$	142,791	$	13,611	$	6,720	$	23,806	$	26,622	$	213,550
Loans:
Individually evaluated for impairment	$	231,988	$	3,894	$	235,882	$	13,599	$	1,592	$	3,236	$	2,149	$	256,458
Purchased credit impaired loans		6,693		12,468		19,161		7,669		4,326		138,260		9,951		179,367
Collectively evaluated for impairment		7,835,606		2,031,089		9,866,695		2,483,836		1,246,749		2,124,767		2,046,996		17,769,043
Total loans	$	8,074,287	$	2,047,451	$	10,121,738	$	2,505,104	$	1,252,667	$	2,266,263	$	2,059,096	$	18,204,868

			Commercial				Commercial
	Commercial		real estate-		Total		real estate-		Construction
	non-real		owner		commercial &		income		and land		Residential
(in thousands)	estate		occupied		industrial		producing		development		mortgages		Consumer		Total
	Three months ended March 31, 2016
Allowance for loan  losses:
Beginning balance	$	109,428	$	9,858	$	119,286	$	6,041	$	5,642	$	25,353	$	24,857	$	181,179
Purchased credit impaired activity:
Charge-offs		—		(28)		(28)		(1)		(18)		—		—		(47)
Recoveries		3		35		38		1		35		1		39		114
Net provision for loan losses		7		(194)		(187)		(109)		(151)		1,130		(1,179)		(496)
Decrease in FDIC loss share receivable		(17)		—		(17)		—		—		(2,153)		(19)		(2,189)
Non-purchased credit impaired activity:
Charge-offs		(17,667)		(783)		(18,450)		(115)		(110)		(175)		(5,843)		(24,693)
Recoveries		809		41		850		144		605		301		1,494		3,394
Net provision for loan losses		52,096		5,667		57,763		1,632		(1,627)		235		2,529		60,532
Ending balance	$	144,659	$	14,596	$	159,255	$	7,593	$	4,376	$	24,692	$	21,878	$	217,794
Ending balance:
Allowance:
Individually evaluated for impairment	$	26,502	$	67	$	26,569	$	1,272	$	185	$	125	$	16	$	28,167
Amounts related to purchased credit impaired loans		439		906		1,345		605		523		16,641		1,388		20,502
Collectively evaluated for impairment		117,718		13,623		131,341		5,716		3,668		7,926		20,474		169,125
Total allowance	$	144,659	$	14,596	$	159,255	$	7,593	$	4,376	$	24,692	$	21,878	$	217,794
Loans:
Individually evaluated for impairment	$	201,029	$	6,018	$	207,047	$	8,681	$	14,072	$	883	$	58	$	230,741
Purchased credit impaired loans		12,659		15,864		28,523		11,185		8,930		161,078		12,177		221,893
Collectively evaluated for impairment		6,931,718		1,901,465		8,833,183		1,732,879		1,072,412		1,839,006		2,048,010		15,525,490
Total loans	$	7,145,406	$	1,923,347	$	9,068,753	$	1,752,745	$	1,095,414	$	2,000,967	$	2,060,245	$	15,978,124

Composition of Nonaccrual Loans by Portfolio Class

	March 31,		December 31,
(in thousands)	2017		2016
Commercial non-real estate	$	198,137	$	249,037
Commercial real estate - owner occupied		11,167		14,413
Total commercial & industrial		209,304		263,450
Commercial real estate - income producing		13,348		13,954
Construction and land development		3,561		4,550
Residential mortgages		23,012		23,665
Consumer		13,424		12,351
Total loans	$	262,649	$	317,970

Troubled Debt Restructurings Modified by Portfolio Class

	Three months Ended
($ in thousands)		March 31, 2017						March 31, 2016
			Pre-Modification		Post-Modification				Pre-Modification		Post-Modification
			Outstanding		Outstanding				Outstanding		Outstanding
		Number of	Recorded		Recorded			Number of	Recorded		Recorded
Troubled Debt Restructurings:		Contracts	Investment		Investment		Contracts		Investment		Investment
Commercial non-real estate		9	$	38,659	$	38,659		11	$	51,246	$	51,246
Commercial real estate - owner occupied		1		656		656		—		—		—
Total commercial & industrial		10		39,315		39,315		11		51,246		51,246
Commercial real estate - income producing		2		5,527		5,527		—		—		—
Construction and land development		—		—		—		—		—		—
Residential mortgages		1		250		250		—		—		—
Consumer		—		—		—		—		—		—
Total loans		13	$	45,092	$	45,092		11	$	51,246	$	51,246

Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class

	March 31, 2017
		Recorded investment		Recorded investment		Unpaid
(in thousands)		without an allowance		with an allowance		principal balance		Related allowance
Commercial non-real estate	$	120,166	$	111,822	$	244,153	$	15,017
Commercial real estate - owner occupied		2,801		1,093		4,265		76
Total commercial & industrial		122,967		112,915		248,418		15,093
Commercial real estate - income producing		5,740		7,859		13,934		1,114
Construction and land development		1,576		16		2,556		1
Residential mortgages		2,158		1,078		3,761		94
Consumer		1,243		906		2,149		199
Total loans	$	133,684	$	122,774	$	270,818	$	16,501
	December 31, 2016
		Recorded investment		Recorded investment		Unpaid
(in thousands)		without an allowance		with an allowance		principal balance		Related allowance
Commercial non-real estate	$	150,650	$	120,612	$	295,445	$	28,187
Commercial real estate - owner occupied		4,261		2,007		6,646		246
Total commercial & industrial		154,911		122,619		302,091		28,433
Commercial real estate - income producing		10,447		4,929		15,708		466
Construction and land development		1,106		832		2,903		38
Residential mortgages		2,877		1,470		4,865		91
Consumer		—		2,154		2,155		267
Total loans	$	169,341	$	132,004	$	327,722	$	29,295

	Three Months Ended
	March 31, 2017				March 31, 2016
	Average		Interest		Average			Interest
	recorded		income		recorded			income
(in thousands)	investment		recognized		investment			recognized
Commercial non-real estate	$	251,625	$	337	$	141,326	$	182
Commercial real estate - owner occupied		5,081		4		5,713		14
Total commercial & industrial		256,706		341		147,039		196
Commercial real estate - income producing		14,487		43		9,902		22
Construction and land development		1,766		—		14,149		—
Residential mortgages		3,792		2		889		2
Consumer		2,152		2		105		1
Total loans	$	278,903	$	388	$	172,084	$	221

Age Analysis of Past Due Loans by Portfolio Class

													Recorded
					Greater than								investment
	30-59 days		60-89 days		90 days		Total				Total		> 90 days and
March 31, 2017	past due		past due		past due		past due		Current		Loans		still accruing
(in thousands)
Commercial non-real estate	$	52,677	$	15,530	$	60,536	$	128,743	$	7,945,544	$	8,074,287	$	245
Commercial real estate - owner occupied		3,907		1,726		5,578		11,211		2,036,240		2,047,451		35
Total commercial & industrial		56,584		17,256		66,114		139,954		9,981,784		10,121,738		280
Commercial real estate - income producing		4,365		1,688		4,814		10,867		2,494,237		2,505,104		185
Construction and land development		14,845		343		2,944		18,132		1,234,535		1,252,667		25
Residential mortgages		18,104		5,104		15,655		38,863		2,227,400		2,266,263		—
Consumer		16,446		5,537		7,736		29,719		2,029,377		2,059,096		100
Total	$	110,344	$	29,928	$	97,263	$	237,535	$	17,967,333	$	18,204,868	$	590

													Recorded
					Greater than								investment
	30-59 days		60-89 days		90 days		Total				Total		> 90 days and
December 31, 2016	past due		past due		past due		past due		Current		Loans		still accruing
(in thousands)
Commercial non-real estate	$	19,722	$	1,909	$	68,505	$	90,136	$	7,523,781	$	7,613,917	$	384
Commercial real estate - owner occupied		3,008		581		6,310		9,899		1,896,922		1,906,821		52
Total commercial & industrial		22,730		2,490		74,815		100,035		9,420,703		9,520,738		436
Commercial real estate - income producing		838		50		5,026		5,914		2,007,976		2,013,890		216
Construction and land development		694		171		5,300		6,165		1,004,714		1,010,879		1,563
Residential mortgages		24,599		8,816		14,369		47,784		2,098,929		2,146,713		1
Consumer		18,621		7,441		9,147		35,209		2,024,722		2,059,931		823
Total	$	67,482	$	18,968	$	108,657	$	195,107	$	16,557,044	$	16,752,151	$	3,039

Changes in Carrying Amount of Purchased Credit Impaired Loans and Related Accretable Yield

	March 31, 2017				December 31, 2016
	Carrying				Carrying
	Amount		Accretable		Amount		Accretable
(in thousands)	of Loans		Yield		of Loans		Yield
Balance at beginning of period	$	190,915	$	113,686	$	225,838	$	129,488
Payments received, net		(16,422)		(1,477)		(55,194)		(11,024)
Accretion		4,874		(4,874)		20,271		(20,271)
Increase (decrease) in expected cash flows based on actual cash flows and changes in cash flow assumptions		—		4,318		—		5,358
Net transfers to (from) nonaccretable difference to accretable yield		—		3,422		—		10,135
Balance at end of period	$	179,367	$	115,075	$	190,915	$	113,686

Activity in Loss Share Receivable

	Three months Ended
	March 31,		March 31,
(in thousands)	2017		2016
Beginning Balance	$	16,219	$	29,868
Amortization		(1,100)		(1,613)
Charge-offs, write-downs and other recoveries		(1,231)		(1,005)
External expenses qualifying under loss share agreement		131		465
Changes due to changes in cash flow projections		(1,830)		(2,189)
Net payments to FDIC		1,131		302
Ending balance	$	13,320	$	25,828

Total Commercial [Member]

Accounts, Notes, Loans and Financing Receivable [Line Items]

Credit Quality Indicators by Segments and Portfolio Class

	March 31, 2017
(in thousands)	Commercial non-real estate		Commercial real estate - owner-occupied		Total commercial & industrial		Commercial real estate - income producing		Construction and land development		Total commercial
Grade:
Pass	$	6,839,049	$	1,840,799	$	8,679,848	$	2,292,057	$	1,139,772	$	12,111,677
Pass-Watch		296,914		46,048		342,962		141,063		93,309		577,334
Special Mention		182,128		55,919		238,047		30,360		8,311		276,718
Substandard		744,326		104,685		849,011		41,614		11,275		901,900
Doubtful		11,870		—		11,870		10		—		11,880
Total	$	8,074,287	$	2,047,451	$	10,121,738	$	2,505,104	$	1,252,667	$	13,879,509
	December 31, 2016
(in thousands)	Commercial non-real estate		Commercial real estate - owner-occupied		Total commercial & industrial		Commercial real estate - income producing		Construction and land development		Total commercial
Grade:
Pass	$	6,364,348	$	1,719,114	$	8,083,462	$	1,873,644	$	968,505	$	10,925,611
Pass-Watch		203,311		47,676		250,987		78,309		22,592		351,888
Special Mention		181,763		40,299		222,062		22,492		4,142		248,696
Substandard		846,793		99,732		946,525		39,434		15,640		1,001,599
Doubtful		17,702		—		17,702		11		—		17,713
Total	$	7,613,917	$	1,906,821	$	9,520,738	$	2,013,890	$	1,010,879	$	12,545,507

Residential Mortgage and Consumer [Member]

Accounts, Notes, Loans and Financing Receivable [Line Items]

Credit Quality Indicators by Segments and Portfolio Class

	March 31, 2017						December 31, 2016
(in thousands)	Residential mortgage		Consumer		Total		Residential mortgage		Consumer		Total
Performing	$	2,243,251	$	2,045,572	$	4,288,823	$	2,123,048	$	2,046,757	$	4,169,805
Nonperforming		23,012		13,524		36,536		23,665		13,174		36,839
Total	$	2,266,263	$	2,059,096	$	4,325,359	$	2,146,713	$	2,059,931	$	4,206,644