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Allowance for Probable Loan Losses (Tables)

12 Months Ended

Dec. 31, 2018

Allowance for Probable Loan Losses

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

		December 31, 2018
		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,		$	27,905		$	11,675		$	16,663		$	1,109		$	2,950		$	6,103		$	440		$	842		$	67,687
Losses charge to allowance			(14,220)			(1)			(70)			—			(122)			(347)			(362)			(3)			(15,125)
Recoveries credited to allowance			1,981			25			246			—			36			369			43			10			2,710
Net losses charged to allowance			(12,239)			24			176			—			(86)			22			(319)			7			(12,415)
Provision (credit) charged to operations			(3,070)			3,424			2,514			699			603			1,594			326			22			6,112
Balance at December 31,		$	12,596		$	15,123		$	19,353		$	1,808		$	3,467		$	7,719		$	447		$	871		$	61,384

		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

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

		December 31, 2018
		Loans Individually						Loans Collectively
		Evaluated For						Evaluated For
		Impairment						Impairment
		Recorded						Recorded
		Investment			Allowance			Investment			Allowance
		(Dollars in Thousands)
Domestic
Commercial		$	9,179		$	656		$	1,119,790		$	11,940
Commercial real estate: other construction & land development			2,092			116			1,884,139			15,007
Commercial real estate: farmland & commercial			3,509			—			1,946,389			19,353
Commercial real estate: multifamily			507			—			225,750			1,808
Residential: first lien			6,244			—			439,556			3,467
Residential: junior lien			901			—			726,400			7,719
Consumer			1,175			—			45,141			447
Foreign			293			—			150,224			871
Total		$	23,900		$	772		$	6,537,389		$	60,612

		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

Loans accounted on non-accrual basis, by loan class

		December 31, 2018			December 31, 2017
		(Dollars in Thousands)
Domestic
Commercial		$	9,143		$	17,909
Commercial real estate: other construction & land development			2,092			2,455
Commercial real estate: farmland & commercial			3,509			33,123
Commercial real estate: multifamily			507			476
Residential: first lien			347			712
Residential: junior lien			171			11
Consumer			22			44
Total non-accrual loans		$	15,791		$	54,730

Impaired loans, by loan class

The following tables detail key information regarding our impaired loans by loan class for the year ended December 31, 2018:

		December 31, 2018
					Unpaid						Average
		Recorded			Principal			Related			Recorded			Interest
		Investment			Balance			Allowance			Investment			Recognized
		(Dollars in Thousands)
Loans with Related Allowance
Domestic
Commercial		$	1,563		$	2,161		$	656		$	1,741		$	—
Commercial real estate: other construction & land development			135			169			116			141			—
Total impaired loans with related allowance		$	1,698		$	2,330		$	772		$	1,882		$	—

		December 31, 2018
					Unpaid			Average
		Recorded			Principal			Recorded			Interest
		Investment			Balance			Investment			Recognized
		(Dollars in Thousands)
Loans with No Related Allowance
Domestic
Commercial		$	7,616		$	7,730		$	16,194		$	3
Commercial real estate: other construction & land development			1,957			2,205			2,151			—
Commercial real estate: farmland & commercial			3,509			4,031			36,632			—
Commercial real estate: multifamily			507			538			565			—
Residential: first lien			6,244			6,386			7,136			305
Residential: junior lien			901			911			976			44
Consumer			1,175			1,190			1,211			2
Foreign			293			293			327			14
Total impaired loans with no related allowance		$	22,202		$	23,284		$	65,192		$	368

The following tables detail key information regarding our 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 real estate: other construction & land development		$	1,300		$	1,577		$	300			1,346			—
Commercial real estate: farmland & commercial			145			169			116			150			—
Commercial real estate: multifamily			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

Loans accounted for as trouble debt restructuring, by loan class

		December 31, 2018			December 31, 2017
			(Dollars in Thousands)
Domestic
Commercial		$	35		$	6,910
Commercial real estate:  farmland & commercial			—			—
Residential:  first lien			5,947			6,140
Residential:  junior lien			730			712
Consumer			1,153			1,237
Foreign			293			347
Total troubled debt restructuring		$	8,158		$	15,346

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

		December 31, 2018
											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		$	4,651		$	1,089		$	19,851		$	10,890		$	25,591		$	1,103,378		$	1,128,969
Commercial real estate: other construction & land development			727			1,707			922			16			3,356			1,882,875			1,886,231
Commercial real estate: farmland & commercial			2,928			784			27,239			24,910			30,951			1,918,947			1,949,898
Commercial real estate: multifamily			927			—			578			71			1,505			224,752			226,257
Residential: first lien			3,998			1,677			3,362			3,079			9,037			436,763			445,800
Residential: junior lien			1,155			618			1,108			937			2,881			724,420			727,301
Consumer			486			19			45			32			550			45,766			46,316
Foreign			1,106			117			739			739			1,962			148,555			150,517
Total past due loans		$	15,978		$	6,011		$	53,844		$	40,674		$	75,833		$	6,485,456		$	6,561,289

			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

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

					December 31, 2018
					Special			Watch			Watch List—			Watch List—
		Pass			Review			List—Pass			Substandard			Impaired
					(Dollars in Thousands)
Domestic
Commercial		$	998,625		$	441		$	44,544		$	76,180		$	9,179
Commercial real estate: other construction & land development			1,817,098			1,648			9,055			56,338			2,092
Commercial real estate: farmland & commercial			1,726,711			62,046			38,373			119,259			3,509
Commercial real estate: multifamily			224,823			—			—			927			507
Residential: first lien			438,773			—			142			641			6,244
Residential: junior lien			725,538			—			862			—			901
Consumer			45,141			—			—			—			1,175
Foreign			150,224			—			—			—			293
Total		$	6,126,933		$	64,135		$	92,976		$	253,345		$	23,900

					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

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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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