Loans (Tables)

12 Months Ended

Dec. 31, 2020

Loans and Leases Receivable, Net Amount [Abstract]

Analysis of Loan Portfolio by Major Types of Loans

The Company’s loan portfolio includes originated and purchased loans. The following is an analysis of the loan portfolio by segment (net of unearned income):

	December 31,
	2020		2019
	(in thousands)
Commercial loans:
Commercial real estate	$	4,062,313	$	3,945,853
Commercial business	3,597,968		2,989,613
Agriculture	779,627		765,371
Construction	268,663		361,533
Consumer loans:
One-to-four family residential real estate	683,570		637,325
Other consumer	35,519		43,770
Total loans	9,427,660		8,743,465
Less: Allowance for credit losses	(149,140)		(83,968)
Total loans, net	$	9,278,520	$	8,659,497

Analysis of the Aged Loan Portfolio

The following is an aging of the amortized cost of the loan portfolio as of December 31, 2020 and 2019:

	Current Loans		30 - 59 Days Past Due		60 - 89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Nonaccrual Loans		Total Loans
December 31, 2020	(in thousands)
Commercial loans:
Commercial real estate	$	4,037,309	$	17,292	$	—	$	—	$	17,292	$	7,712	$	4,062,313
Commercial business	3,578,905		1,282		4,559		—		5,841		13,222		3,597,968
Agriculture	767,102		911		—		—		911		11,614		779,627
Construction	268,304		—		142		—		142		217		268,663
Consumer loans:
One-to-four family residential real estate	677,627		2,283		1,659		—		3,942		2,001		683,570
Other consumer	35,450		24		5		—		29		40		35,519
Total	$	9,364,697	$	21,792	$	6,365	$	—	$	28,157	$	34,806	$	9,427,660
	Current Loans		30 - 59 Days Past Due		60 - 89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Nonaccrual Loans		Total Loans
December 31, 2019	(in thousands)
Commercial loans:
Commercial real estate	$	3,935,633	$	6,421	$	—	—		$	6,421	$	3,799	$	3,945,853
Commercial business	2,959,826		6,081		2,769		—		8,850		20,937		2,989,613
Agriculture	755,719		2,283		2,346		—		4,629		5,023		765,371
Construction	360,582		951		—		—		951		—		361,533
Consumer loans:
One-to-four family residential real estate	631,109		2,516		408		—		2,924		3,292		637,325
Other consumer	43,654		80		27		—		107		9		43,770
Total	$	8,686,523	$	18,332	$	5,550	$	—	$	23,882	$	33,060	$	8,743,465

Interest written off on nonaccrual loans

The following table summarizes written-off interest on nonaccrual loans for the years ended December 31, 2020, 2019 and 2018:

	Years Ended December 31,
	2020		2019		2018
	(in thousands)
Commercial loans	$	1,972	$	1,475	$	1,296
Consumer loans	28		196		268
Total	$	2,000	$	1,671	$	1,564

Analysis of Nonaccrual Loans

The following summarizes the amortized cost of nonaccrual loans for which there was no related ACL as of December 31, 2020 and 2019:

	December 31, 2020		December 31, 2019
	(in thousands)
Commercial loans:
Commercial real estate	$	6,393	$	1,715
Commercial business	6,382		15,762
Agriculture	8,136		1,798
Total	$	20,911	$	19,275

Analysis of loans classified as Troubled Debt Restructurings (“TDR”)

The following is an analysis of loans classified as TDR for the years ended December 31, 2020, 2019 and 2018:

	Years Ended December 31,
	2020					2019					2018
	Number of TDR Modifications	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Number of TDR Modifications	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Number of TDR Modifications	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
	(dollars in thousands)
Commercial loans:
Commercial real estate	—	$	—	$	—	—	$	—	$	—	1	$	891	$	891
Commercial business	11	3,257		3,257		10	6,560		6,560		10	18,352		18,352
Agriculture	2	3,495		3,495		—	—		—		2	27		27
Consumer loans:
One-to-four family residential real estate	6	814		814		13	787		787		21	2,777		2,777
Other consumer	—	—		—		1	1		1		—	—		—
Total	19	$	7,566	$	7,566	24	$	7,348	$	7,348	34	$	22,047	$	22,047