Loans (Tables)

12 Months Ended

Dec. 31, 2022

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,
	2022		2021
	(in thousands)
Commercial loans:
Commercial real estate	$	5,352,785	$	4,981,263
Commercial business	3,750,564		3,423,268
Agriculture	848,903		795,715
Construction	540,861		384,755
Consumer loans:
One-to-four family residential real estate	1,077,494		1,013,908
Other consumer	40,366		43,028
Total loans	11,610,973		10,641,937
Less: Allowance for credit losses	(158,438)		(155,578)
Total loans, net	$	11,452,535	$	10,486,359

Analysis of the Aged Loan Portfolio

The following is an aging of the amortized cost of the loan portfolio as of December 31, 2022 and 2021:

	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, 2022	(in thousands)
Commercial loans:
Commercial real estate	$	5,338,999	$	6,756	$	3,786	$	—	$	10,542	$	3,244	$	5,352,785
Commercial business	3,739,731		4,336		1,364		—		5,700		5,133		3,750,564
Agriculture	842,506		493		1,537		—		2,030		4,367		848,903
Construction	540,861		—		—		—		—		—		540,861
Consumer loans:
One-to-four family residential real estate	1,072,211		4,315		283		—		4,598		685		1,077,494
Other consumer	40,172		160		22		—		182		12		40,366
Total	$	11,574,480	$	16,060	$	6,992	$	—	$	23,052	$	13,441	$	11,610,973
	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

Interest written off on nonaccrual loans

The following table summarizes written-off interest on nonaccrual loans for the years ended December 31, 2022, 2021 and 2020:

	Years Ended December 31,
	2022		2021		2020
	(in thousands)
Commercial loans	$	604	$	628	$	1,972
Consumer loans	25		45		28
Total	$	629	$	673	$	2,000

Analysis of Nonaccrual Loans

The following summarizes the amortized cost of nonaccrual loans for which there was no related ACL as of December 31, 2022 and 2021:

	December 31, 2022		December 31, 2021
	(in thousands)
Commercial loans:
Commercial real estate	$	2,281	$	932
Commercial business	815		5,131
Agriculture	2,111		3,756
Total	$	5,207	$	9,819

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, 2022, 2021 and 2020:

	Years Ended December 31,
	2022					2021					2020
	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	2	637		637		11	2,600		2,600		11	3,257		3,257
Agriculture	1	633		633		1	583		583		2	3,495		3,495
Consumer loans:
One-to-four family residential real estate	1	50		50		3	155		155		6	814		814
Other consumer	—	—		—		—	—		—		—	—		—
Total	4	$	1,320	$	1,320	16	$	3,966	$	3,966	19	$	7,566	$	7,566