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Allowance for Probable Loan Losses (Tables)

12 Months Ended

Dec. 31, 2017

Allowance for Probable Loan Losses

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

		December 31, 2017
		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,		$	25,649		$	13,889		$	16,731		$	806		$	2,455		$	3,716		$	531		$	884		$	64,661
Losses charge to allowance			(12,094)			(213)			(40)			—			(101)			(340)			(309)			(1)			(13,098)
Recoveries credited to allowance			4,020			21			527			—			11			258			45			21			4,903
Net losses charged to allowance			(8,074)			(192)			487			—			(90)			(82)			(264)			20			(8,195)
Provision (credit) charged to operations			10,330			(2,022)			(555)			303			585			2,469			173			(62)			11,221
Balance at December 31,		$	27,905		$	11,675		$	16,663		$	1,109		$	2,950		$	6,103		$	440		$	842		$	67,687

		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

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

		December 31, 2017
		Loans Individually						Loans Collectively
		Evaluated For						Evaluated For
		Impairment						Impairment
		Recorded						Recorded
		Investment			Allowance			Investment			Allowance
		(Dollars in Thousands)
Domestic
Commercial		$	17,947		$	300		$	1,068,520		$	27,605
Commercial real estate: other construction & land development			2,455			116			1,681,095			11,559
Commercial real estate: farmland & commercial			33,123			18			2,010,162			16,645
Commercial real estate: multifamily			476			—			192,440			1,109
Residential: first lien			6,852			—			425,925			2,950
Residential: junior lien			723			—			700,025			6,103
Consumer			1,281			—			48,262			440
Foreign			347			—			158,539			842
Total		$	63,204		$	434		$	6,284,968		$	67,253

		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

Loans accounted on non-accrual basis, by loan class

		December 31, 2017			December 31, 2016
		(Dollars in Thousands)
Domestic
Commercial		$	17,909		$	22,369
Commercial real estate: other construction & land development			2,455			4,776
Commercial real estate: farmland & commercial			33,123			8,314
Commercial real estate: multifamily			476			552
Residential: first lien			712			655
Residential: junior lien			11			166
Consumer			44			26
Foreign			—			387
Total non-accrual loans		$	54,730		$	37,245

Impaired loans, by loan class

The following tables detail key information regarding the Company’s impaired loans by loan class for the year ended December 31, 2017:

		December 31, 2017
					Unpaid						Average
		Recorded			Principal			Related			Recorded			Interest
		Investment			Balance			Allowance			Investment			Recognized
		(Dollars in Thousands)
Loans with Related Allowance
Domestic
Commercial		$	1,300		$	1,577		$	300		$	1,346		$	—
Commercial real estate: other construction & land development			145			169			116			150			—
Commercial real estate: farmland & commercial			449			590			18			489			—
Total impaired loans with related allowance		$	1,894		$	2,336		$	434		$	1,985		$	—

		December 31, 2017
					Unpaid			Average
		Recorded			Principal			Recorded			Interest
		Investment			Balance			Investment			Recognized
		(Dollars in Thousands)
Loans with No Related Allowance
Domestic
Commercial		$	16,646		$	44,095		$	19,615		$	3
Commercial real estate: other construction & land development			2,310			2,455			3,493			—
Commercial real estate: farmland & commercial			32,675			33,275			38,536			—
Commercial real estate: multifamily			476			505			511			—
Residential: first lien			6,852			6,968			7,249			324
Residential: junior lien			723			736			970			45
Consumer			1,281			1,283			1,293			3
Foreign			347			347			750			16
Total impaired loans with no related allowance		$	61,310		$	89,664		$	72,417		$	391

The following tables detail key information regarding the Company’s impaired loans by loan class for the year ended December 31, 2016:

		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			—
Commercial real estate: multifamily			62			62			44			62			—
Total impaired loans with related allowance		$	4,828		$	5,981		$	961		$	9,579		$	—

		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

Loans accounted for as trouble debt restructuring, by loan class

		December 31, 2017			December 31, 2016
			(Dollars in Thousands)
Domestic
Commercial		$	6,910		$	10,710
Commercial real estate:  farmland & commercial			—			3,086
Residential:  first lien			6,140			6,181
Residential:  junior lien			712			812
Consumer			1,237			1,269
Foreign			347			360
Total troubled debt restructuring		$	15,346		$	22,418

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

		December 31, 2017
											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		$	3,790		$	398		$	18,308		$	537		$	22,496		$	1,063,971		$	1,086,467
Commercial real estate: other construction & land development			354			308			820			6			1,482			1,682,068			1,683,550
Commercial real estate: farmland & commercial			3,925			518			31,133			954			35,576			2,007,709			2,043,285
Commercial real estate: multifamily			84			—			476			—			560			192,356			192,916
Residential: first lien			4,295			2,458			4,095			3,861			10,848			421,929			432,777
Residential: junior lien			1,310			580			1,110			1,099			3,000			697,748			700,748
Consumer			868			98			160			133			1,126			48,417			49,543
Foreign			1,229			69			667			667			1,965			156,921			158,886
Total past due loans		$	15,855		$	4,429		$	56,769		$	7,257		$	77,053		$	6,271,119		$	6,348,172

		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

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

					December 31, 2017
					Special			Watch			Watch List—			Watch List—
		Pass			Review			List—Pass			Substandard			Impaired
					(Dollars in Thousands)
Domestic
Commercial		$	905,707		$	—		$	3,170		$	159,643		$	17,947
Commercial real estate: other construction & land development			1,616,604			1,288			672			62,531			2,455
Commercial real estate: farmland & commercial			1,863,763			5,134			41,820			99,445			33,123
Commercial real estate: multifamily			192,440			—			—			—			476
Residential: first lien			425,811			40			—			74			6,852
Residential: junior lien			699,875			150			—			—			723
Consumer			48,262			—			—			—			1,281
Foreign			158,539			—			—			—			347
Total		$	5,911,001		$	6,612		$	45,662		$	321,693		$	63,204

					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

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Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account.

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Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics.

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Tabular disclosure of financing receivables that are past due but not impaired, financing receivables that are 90 days past due and still accruing, and financing receivables on nonaccrual status.

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Tabular disclosure of the activity in the total allowance for credit losses related to financing receivables (such as loans or lease receivables) for entities that have an unclassified balance sheet, including the balance in the allowance at the beginning and end of each period, additions charged to operations, direct write-downs charged against the allowance, and recoveries of amounts previously charged off.

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Tabular disclosure of nonaccrual and past due financing receivables (such as loans and trade receivables), including: (a) the recorded investment in loans and trade receivables, if applicable, on nonaccrual status as of each balance sheet date (b) the recorded investment in loans and trade receivables, if applicable, past due 90 days or more and still accruing.

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Tabular disclosure of financing receivables and troubled debt restructurings.

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