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Allowance for Probable Loan Losses (Tables)

12 Months Ended

Dec. 31, 2016

Allowance for Probable Loan Losses

Summary of the transactions in the allowance for probable loan losses by loan class

		December 31, 2016
		Domestic																					Foreign
					Commercial
					real estate:
					other			Commercial
					construction &			real estate:			Commercial
					land			farmland &			real estate:			Residential:			Residential:
		Commercial			development			commercial			multifamily			first lien			junior lien			Consumer			Foreign			Total
		(Dollars in Thousands)
Balance at December 31,		$	21,431		$	13,920		$	19,769		$	1,248		$	3,509		$	5,321		$	638		$	1,152		$	66,988
Losses charge to allowance			(32,959)			(16)			(1,890)			(180)			(70)			(331)			(414)			(41)			(35,901)
Recoveries credited to allowance			7,110			6,099			119			—			21			278			69			19			13,715
Net losses charged to allowance			(25,849)			6,083			(1,771)			(180)			(49)			(53)			(345)			(22)			(22,186)
Provision (credit) charged to operations			30,067			(6,114)			(1,267)			(262)			(1,005)			(1,552)			238			(246)			19,859
Balance at December 31,		$	25,649		$	13,889		$	16,731		$	806		$	2,455		$	3,716		$	531		$	884		$	64,661

		December 31, 2015
		Domestic																																								Foreign
							Commercial
							real estate:
							other						Commercial
							construction &						real estate:						Commercial
							land						farmland &						real estate:						Residential:						Residential:
		Commercial						development					commercial						multifamily						first lien						junior lien						Consumer						Foreign						Total
		(Dollars in Thousands)
Balance at December 31,		$	22,352			$			12,955			$		18,683				$		846				$		3,589				$		4,683				$		660				$		1,060				$		64,828
Losses charge to allowance			(24,802)						(695)					(492)						—						(157)						(275)						(704)						—						(27,125)
Recoveries credited to allowance			3,135						141					963						—						30						431						170						10						4,880
Net losses charged to allowance			(21,667)						(554)					471						—						(127)						156						(534)						10						(22,245)
Provision (credit) charged to operations			20,746						1,519					615						402						47						482						512						82						24,405
Balance at December 31,		$	21,431			$			13,920			$		19,769				$		1,248				$		3,509				$		5,321				$		638				$		1,152				$		66,988

		December 31, 2014
		Domestic																					Foreign
					Commercial
					real estate:
					other			Commercial
					construction &			real estate:			Commercial
					land			farmland &			real estate:			Residential:			Residential:
		Commercial			development			commercial			multifamily			first lien			junior lien			Consumer			Foreign			Total
		(Dollars in Thousands)
Balance at December 31,		$	22,433		$	12,541		$	24,467		$	776		$	3,812		$	4,249		$	750		$	1,133		$	70,161
Losses charge to allowance			(19,110)			(680)			(1,893)			—			(351)			(661)			(719)			(51)			(23,465)
Recoveries credited to allowance			2,979			72			107			—			49			242			210			50			3,709
Net losses charged to allowance			(16,131)			(608)			(1,786)			—			(302)			(419)			(509)			(1)			(19,756)
Provision (credit) charged to operations			16,050			1,022			(3,998)			70			79			853			419			(72)			14,423
Balance at December 31,		$	22,352		$	12,955		$	18,683		$	846		$	3,589		$	4,683		$	660		$	1,060		$	64,828

Loans individually or collectively evaluated for their impairment and related allowance, by loan class

		December 31, 2016
		Loans Individually						Loans Collectively
		Evaluated For						Evaluated For
		Impairment						Impairment
		Recorded						Recorded
		Investment			Allowance			Investment			Allowance
		(Dollars in Thousands)
Domestic
Commercial		$	22,412		$	—		$	887,255		$	25,649
Commercial real estate: other construction & land development			4,776			371			1,712,099			13,518
Commercial real estate: farmland & commercial			10,810			546			1,932,260			16,185
Commercial real estate: multifamily			552			—			139,914			806
Residential: first lien			6,836			44			415,068			2,411
Residential: junior lien			978			—			609,340			3,716
Consumer			1,295			—			53,873			531
Foreign			746			—			166,474			884
Total		$	48,405		$	961		$	5,916,283		$	63,700

		December 31, 2015
		Loans Individually						Loans Collectively
		Evaluated For						Evaluated For
		Impairment						Impairment
		Recorded						Recorded
		Investment			Allowance			Investment			Allowance
		(Dollars in Thousands)
Domestic
Commercial		$	30,946		$	1,704		$	935,905		$	19,727
Commercial real estate: other construction & land development			6,221			100			1,643,606			13,820
Commercial real estate: farmland & commercial			13,806			202			1,981,643			19,567
Commercial real estate: multifamily			777			200			138,671			1,048
Residential: first lien			5,699			—			404,545			3,509
Residential: junior lien			950			—			551,388			5,321
Consumer			1,297			—			56,447			638
Foreign			752			—			178,261			1,152
Total		$	60,448		$	2,206		$	5,890,466		$	64,782

Loans accounted on non-accrual basis, by loan class

		December 31, 2016			December 31, 2015
		(Dollars in Thousands)
Domestic
Commercial		$	22,369		$	30,894
Commercial real estate: other construction & land development			4,776			3,668
Commercial real estate: farmland & commercial			8,314			11,543
Commercial real estate: multifamily			552			777
Residential: first lien			655			383
Residential: junior lien			166			21
Consumer			26			34
Foreign			387			365
Total non-accrual loans		$	37,245		$	47,685

Impaired loans, by loan class

		December 31, 2016
					Unpaid						Average
		Recorded			Principal			Related			Recorded			Interest
		Investment			Balance			Allowance			Investment			Recognized
		(Dollars in Thousands)
Loans with Related Allowance
Domestic
Commercial real estate: other construction & land development		$	1,958		$	1,971		$	371		$	2,512		$	—
Commercial real estate: farmland & commercial			2,808			3,948			546			3,247			—
Residential:  first lien			62			62			44			62			—
Total impaired loans with related allowance		$	4,828		$	5,981		$	961		$	5,821		$	—

		December 31, 2016
					Unpaid			Average
		Recorded			Principal			Recorded			Interest
		Investment			Balance			Investment			Recognized
		(Dollars in Thousands)
Loans with No Related Allowance
Domestic
Commercial		$	21,412		$	50,737		$	19,354		$	3
Commercial real estate: other construction & land development			2,818			4,419			2,336			67
Commercial real estate: farmland & commercial			8,002			9,054			8,523			110
Commercial real estate: multifamily			552			562			401			—
Residential: first lien			6,774			6,847			6,860			298
Residential: junior lien			978			1,017			1,011			52
Consumer			1,295			1,295			1,214			1
Foreign			746			746			751			16
Total impaired loans with no related allowance		$	42,577		$	74,677		$	40,450		$	547

The following tables detail key information regarding the Company’s impaired loans by loan class for the year ended December 31, 2015:

		December 31, 2015
					Unpaid						Average
		Recorded			Principal			Related			Recorded			Interest
		Investment			Balance			Allowance			Investment			Recognized
		(Dollars in Thousands)
Loans with Related Allowance
Domestic
Commercial		$	4,016		$	4,156		$	1,704		$	3,758		$	—
Commercial real estate: other construction & land development			167			169			100			893			—
Commercial real estate: farmland & commercial			4,003			4,309			202			444			92
Commercial real estate: multifamily			599			599			200			599			—
Total impaired loans with related allowance		$	8,785		$	9,233		$	2,206		$	5,694		$	92

		December 31, 2015
					Unpaid			Average
		Recorded			Principal			Recorded			Interest
		Investment			Balance			Investment			Recognized
		(Dollars in Thousands)
Loans with No Related Allowance
Domestic
Commercial		$	26,930		$	38,845		$	30,847		$	4
Commercial real estate: other construction & land development			6,054			6,204			6,455			85
Commercial real estate: farmland & commercial			9,803			10,717			7,258			—
Commercial real estate: multifamily			178			178			205			—
Residential: first lien			5,699			5,822			5,853			264
Residential: junior lien			950			972			1,182			68
Consumer			1,297			1,298			1,227			3
Foreign			752			752			548			17
Total impaired loans with no related allowance		$	51,663		$	64,788		$	53,575		$	441

Loans accounted for as trouble debt restructuring, by loan class

		December 31, 2016			December 31, 2015
			(Dollars in Thousands)
Domestic
Commercial		$	10,710		$	2,419
Commercial real estate:  other construction & land development			—			2,553
Commercial real estate:  farmland & commercial			3,086			2,853
Residential:  first lien			6,181			5,316
Residential:  junior lien			812			929
Consumer			1,269			1,263
Foreign			360			386
Total troubled debt restructuring		$	22,418		$	15,719

Information regarding the aging of past due loans, by loan class

		December 31, 2016
											90 Days or			Total
		30 - 59			60 - 89			90 Days or			greater &			Past						Total
		Days			Days			Greater			still accruing			Due			Current			Portfolio
		(Dollars in Thousands)
Domestic
Commercial		$	4,081		$	829		$	21,123		$	392		$	26,033		$	883,634		$	909,667
Commercial real estate: other construction & land development			1,502			396			4,456			9			6,354			1,710,521			1,716,875
Commercial real estate: farmland & commercial			3,454			3,054			6,150			289			12,658			1,930,412			1,943,070
Commercial real estate: multifamily			44			—			552			—			596			139,870			140,466
Residential: first lien			5,615			1,350			4,143			3,756			11,108			410,796			421,904
Residential: junior lien			762			178			540			382			1,480			608,838			610,318
Consumer			910			95			413			387			1,418			53,750			55,168
Foreign			931			425			397			11			1,753			165,467			167,220
Total past due loans		$	17,299		$	6,327		$	37,774		$	5,226		$	61,400		$	5,903,288		$	5,964,688

		December 31, 2015
											90 Days or			Total
		30 - 59			60 - 89			90 Days or			greater &			Past						Total
		Days			Days			Greater			still accruing			Due			Current			Portfolio
			(Dollars in Thousands)
Domestic
Commercial		$	3,361		$	940		$	28,615		$	2,566		$	32,916		$	933,936		$	966,852
Commercial real estate: other construction & land development			193			293			3,502			—			3,988			1,645,839			1,649,827
Commercial real estate: farmland & commercial			2,684			1,328			8,292			3,373			12,304			1,983,144			1,995,448
Commercial real estate: multifamily			49			442			826			49			1,317			138,131			139,448
Residential: first lien			5,299			1,545			4,295			4,093			11,139			399,105			410,244
Residential: junior lien			713			413			646			640			1,772			550,566			552,338
Consumer			646			175			487			453			1,308			56,436			57,744
Foreign			2,639			83			807			442			3,529			175,484			179,013
Total past due loans		$	15,584		$	5,219		$	47,470		$	11,616		$	68,273		$	5,882,641		$	5,950,914

Summary of the loan portfolio by credit quality indicator, by loan class

					December 31, 2016
					Special			Watch			Watch List—			Watch List—
		Pass			Review			List—Pass			Substandard			Impaired
					(Dollars in Thousands)
Domestic
Commercial		$	720,350		$	90,746		$	1,121		$	75,038		$	22,412
Commercial real estate: other construction & land development			1,648,633			1,986			—			61,480			4,776
Commercial real estate: farmland & commercial			1,792,542			7,983			59,872			71,863			10,810
Commercial real estate: multifamily			139,914			—			—			—			552
Residential: first lien			413,638			814			—			616			6,836
Residential: junior lien			609,190			150			—			—			978
Consumer			53,873			—			—			—			1,295
Foreign			166,474			—			—			—			746
Total		$	5,544,614		$	101,679		$	60,993		$	208,997		$	48,405

					December 31, 2015
					Special			Watch			Watch List—			Watch List—
		Pass			Review			List—Pass			Substandard			Impaired
					(Dollars in Thousands)
Domestic
Commercial		$	771,999		$	42,152		$	31,539		$	90,215		$	30,946
Commercial real estate: other construction & land development			1,582,683			1,164			13,765			45,994			6,221
Commercial real estate: farmland & commercial			1,849,587			2,283			37,765			92,008			13,806
Commercial real estate: multifamily			138,546			—			—			125			777
Residential: first lien			401,053			—			—			3,492			5,699
Residential: junior lien			551,138			—			—			250			950
Consumer			56,440			—			—			7			1,297
Foreign			178,261			—			—			—			752
Total		$	5,529,707		$	45,599		$	83,069		$	232,091		$	60,448

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