Loans (Tables)

12 Months Ended

Dec. 31, 2021

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,
	2021		2020
	(in thousands)
Commercial loans:
Commercial real estate	$	4,981,263	$	4,062,313
Commercial business	3,423,268		3,597,968
Agriculture	795,715		779,627
Construction	384,755		268,663
Consumer loans:
One-to-four family residential real estate	1,013,908		683,570
Other consumer	43,028		35,519
Total loans	10,641,937		9,427,660
Less: Allowance for credit losses	(155,578)		(149,140)
Total loans, net	$	10,486,359	$	9,278,520

Analysis of the Aged Loan Portfolio

The following is an aging of the amortized cost of the loan portfolio as of December 31, 2021 and 2020:

	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, 2021	(in thousands)
Commercial loans:
Commercial real estate	$	4,977,781	$	—	$	1,610	$	—	$	1,610	$	1,872	$	4,981,263
Commercial business	3,406,539		2,721		687		—		3,408		13,321		3,423,268
Agriculture	789,112		1,207		—		—		1,207		5,396		795,715
Construction	384,755		—		—		—		—		—		384,755
Consumer loans:
One-to-four family residential real estate	1,010,343		921		211		—		1,132		2,433		1,013,908
Other consumer	42,998		11		—		—		11		19		43,028
Total	$	10,611,528	$	4,860	$	2,508	$	—	$	7,368	$	23,041	$	10,641,937
	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

Interest written off on nonaccrual loans

The following table summarizes written-off interest on nonaccrual loans for the years ended December 31, 2021, 2020 and 2019:

	Years Ended December 31,
	2021		2020		2019
	(in thousands)
Commercial loans	$	628	$	1,972	$	1,475
Consumer loans	45		28		196
Total	$	673	$	2,000	$	1,671

Analysis of Nonaccrual Loans

The following summarizes the amortized cost of nonaccrual loans for which there was no related ACL as of December 31, 2021 and 2020:

	December 31, 2021		December 31, 2020
	(in thousands)
Commercial loans:
Commercial real estate	$	932	$	6,393
Commercial business	5,131		6,382
Agriculture	3,756		8,136
Total	$	9,819	$	20,911

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, 2021, 2020 and 2019:

	Years Ended December 31,
	2021					2020					2019
	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	$	628	$	628	—	$	—	$	—	—	$	—	$	—
Commercial business	11	2,600		2,600		11	3,257		3,257		10	6,560		6,560
Agriculture	1	583		583		2	3,495		3,495		—	—		—
Consumer loans:
One-to-four family residential real estate	3	155		155		6	814		814		13	787		787
Other consumer	—	—		—		—	—		—		1	1		1
Total	16	$	3,966	$	3,966	19	$	7,566	$	7,566	24	$	7,348	$	7,348