On January 1, 2020, the Company adopted FASB ASU 2016-13, Financial Instruments - Credit Losses, which significantly changed the loan and allowance for credit loss accounting disclosures. The following loan and allowance for credit loss accounting disclosures are presented in accordance with ASC Topic 326.


(Dollars in thousands)	March 31, 2021		December 31, 2020
Residential real estate	$	745,097	802,508
Commercial real estate	6,474,701		6,315,895
Other commercial	3,100,584		3,054,817
Home equity	625,369		636,405
Other consumer	324,178		313,071
Loans receivable	11,269,929		11,122,696
Allowance for credit losses	(156,446)		(158,243)
Loans receivable, net	$	11,113,483	10,964,453
Net deferred origination (fees) costs included in loans receivable	$	(37,946)	(26,709)
Net purchase accounting (discounts) premiums included in loans receivable	$	(15,122)	(17,091)
Accrued interest receivable on loans	$	50,989	53,538

Substantially all of the Company’s loans receivable are with borrowers in the Company’s geographic market areas. Although the Company has a diversified loan portfolio, a substantial portion of borrowers’ ability to service their obligations is dependent upon the economic performance in the Company’s market areas.


	Three Months ended March 31, 2021
(Dollars in thousands)	Total		Residential Real Estate	Commercial Real Estate	Other Commercial	Home Equity	Other Consumer
Balance at beginning of period	$	158,243	9,604	86,999	49,133	8,182	4,325


Provision for credit losses	489		(582)	7,463	(7,265)	(89)	962
Charge-offs	(4,246)		(38)	—	(2,762)	(45)	(1,401)
Recoveries	1,960		34	789	279	20	838
Balance at end of period	$	156,446	9,018	95,251	39,385	8,068	4,724


	Three Months ended March 31, 2020
(Dollars in thousands)	Total		Residential Real Estate	Commercial Real Estate	Other Commercial	Home Equity	Other Consumer
Balance at beginning of period	$	124,490	10,111	69,496	36,129	4,937	3,817
Impact of adopting CECL	3,720		3,584	10,533	(13,759)	3,400	(38)
Acquisitions	49		—	49	—		—
Provision for credit losses	22,744		(4,369)	(9,433)	34,133	(508)	2,921
Charge-offs	(2,567)		(20)	(30)	(785)	(1)	(1,731)
Recoveries	1,754		9	470	454	106	715
Balance at end of period	$	150,190	9,315	71,085	56,172	7,934	5,684

The sizeable charge-offs in the other consumer loan segment is driven by deposit overdraft charge-offs which typically experience high charge-off rates and the amounts were comparable to historical trends. The other segments experience routine charge-offs and recoveries, with occasional large credit relationships charge-offs and recoveries that cause fluctuations from prior periods. During the three months ended March 31, 2021, there have been no significant changes to the types of collateral securing collateral-dependent loans.


	March 31, 2021
(Dollars in thousands)	Total		Residential Real Estate	Commercial Real Estate	Other Commercial	Home Equity	Other Consumer
Accruing loans 30-59 days past due	$	41,744	5,201	5,737	28,277	1,412	1,117
Accruing loans 60-89 days past due	2,872		426	1,476	510	276	184
Accruing loans 90 days or more past due	3,733		188	2,319	961	26	239
Non-accrual loans with no ACL	28,654		3,006	13,484	8,400	2,756	1,008
Non-accrual loans with ACL	1,233		270	451	423	49	40
Total past due and non-accrual loans	78,236		9,091	23,467	38,571	4,519	2,588
Current loans receivable	11,191,693		736,006	6,451,234	3,062,013	620,850	321,590
Total loans receivable	$	11,269,929	745,097	6,474,701	3,100,584	625,369	324,178


	December 31, 2020
(Dollars in thousands)	Total		Residential Real Estate	Commercial Real Estate	Other Commercial	Home Equity	Other Consumer
Accruing loans 30-59 days past due	$	17,123	6,058	3,854	4,039	2,130	1,042
Accruing loans 60-89 days past due	5,598		584	2,299	809	756	1,150
Accruing loans 90 days or more past due	1,725		934	231	293	135	132
Non-accrual loans with no ACL	29,532		3,129	14,030	9,231	2,664	478
Non-accrual loans with ACL	2,432		274	1,787	278	49	44
Total past due and non-accrual loans	56,410		10,979	22,201	14,650	5,734	2,846
Current loans receivable	11,066,286		791,529	6,293,694	3,040,167	630,671	310,225
Total loans receivable	$	11,122,696	802,508	6,315,895	3,054,817	636,405	313,071

The Company had $73,000 of interest reversed on non-accrual loans during the three months ended March 31, 2021. The prior year modifications that were made under the CARES Act, along with related regulatory guidance, are included in current loan receivables.

A loan is considered collateral-dependent when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral. The collateral on the loans is a significant portion of what secures the collateral-dependent loans and significant changes to the fair value of the collateral can impact the ACL. During 2021, there were no significant change to collateral which secures the collateral-dependent loans, whether due to general deterioration or other reasons. The following table presents the amortized cost basis of collateral-dependent loans by collateral type:


	March 31, 2021
(Dollars in thousands)	Total		Residential Real Estate	Commercial Real Estate	Other Commercial	Home Equity	Other Consumer
Business assets	$	26,583	—	33	26,419	—	131
Residential real estate	7,358		3,216	894	191	2,612	445
Other real estate	26,041		654	23,799	1,049	193	346
Other	26,033		—	—	25,597	—	436
Total	$	86,015	3,870	24,726	53,256	2,805	1,358


	December 31, 2020
(Dollars in thousands)	Total		Residential Real Estate	Commercial Real Estate	Other Commercial	Home Equity	Other Consumer
Business assets	$	4,325	—	37	4,288	—	—
Residential real estate	7,148		3,338	1,043	198	2,513	56
Other real estate	16,127		64	14,738	1,086	200	39
Other	36,855		—	—	36,469	—	386
Total	$	64,455	3,402	15,818	42,041	2,713	481

A restructured loan is considered a TDR if the creditor, for economic or legal reasons related to the debtor’s financial difficulties, grants a concession to the debtor that it would not otherwise consider. The following tables present TDRs that occurred during the periods presented and the TDRs that occurred within the previous twelve months that subsequently defaulted during the periods presented:


	Three Months ended March 31, 2021
(Dollars in thousands)	Total		Residential Real Estate	Commercial Real Estate	Other Commercial	Home Equity	Other Consumer
TDRs that occurred during the period
Number of loans	7		1	4	1	—	1
Pre-modification recorded balance	$	1,753	210	1,374	38	—	131
Post-modification recorded balance	$	1,753	210	1,374	38	—	131
TDRs that subsequently defaulted
Number of loans	—		—	—	—	—	—
Recorded balance	$	—	—	—	—	—	—


	Three Months ended March 31, 2020
(Dollars in thousands)	Total		Residential Real Estate	Commercial Real Estate	Other Commercial	Home Equity	Other Consumer
TDRs that occurred during the period
Number of loans	5		—	3	2	—	—
Pre-modification recorded balance	$	7,268	—	6,857	411	—	—
Post-modification recorded balance	$	7,268	—	6,857	411	—	—
TDRs that subsequently defaulted
Number of loans	—		—	—	—	—	—
Recorded balance	$	—	—	—	—	—	—

The modifications for the loans designated as TDRs during the three months ended March 31, 2021 and 2020 included one or a combination of the following: an extension of the maturity date, a reduction of the interest rate or a reduction in the principal amount.

In addition to the loans designated as TDRs during the period provided in the preceding tables, the Company had TDRs with pre-modification loan balances of $1,474,000 and $568,000 for the three months ended March 31, 2021 and 2020, respectively, for which OREO was received in full or partial satisfaction of the loans. The majority of such TDRs were in other commercial for the three months ended March 31, 2021 and commercial real estate for the three months ended March 31, 2020. At March 31, 2021 and December 31, 2020, the Company had $505,000 and $548,000, respectively, of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process. At March 31, 2021 and December 31, 2020, the Company had $930,000 and $273,000, respectively, of OREO secured by residential real estate properties.

The Company also modified loans under the CARES Act, along with related regulatory guidance, that were not classified as TDRs. In addition, the state of Montana created the Montana Loan Deferment Program for only Montana-based business that utilized Cares Act funds to provide interest payments upfront on behalf of participating borrowers. The Montana Loan Deferment Program provided modifications for customers under the CARES Act that were not classified as TDRs.

The Company categorizes commercial real estate and other commercial loans into risk categories based on relevant information about the ability of borrowers to service their obligations. The following tables present the amortized cost in commercial real estate and other commercial loans based on the Company’s internal risk rating. The date of a modification, renewal or extension of a loan is considered for the year of origination if the terms of the loan are as favorable to the Company as the terms are for a comparable loan to other borrowers with similar credit risk.


	March 31, 2021
(Dollars in thousands)	Total		Pass	Special Mention	Substandard	Doubtful/ Loss
Commercial real estate loans
Term loans by origination year
2021 (year-to-date)	$	521,791	521,791	—	—	—
2020	1,419,202		1,413,986	—	5,216	—
2019	1,011,331		1,000,493	—	10,838	—
2018	851,608		810,910	—	40,698	—
2017	672,239		645,700	—	26,539	—
Prior	1,879,439		1,825,762	—	53,593	84
Revolving loans	119,091		116,298	—	2,792	1

Total	$	6,474,701	6,334,940	—	139,676	85
Other commercial loans 1
Term loans by origination year
2021 (year-to-date)	$	538,043	538,039	—	4	—
2020	974,231		947,941	—	26,289	1
2019	281,749		271,082	—	10,664	3
2018	223,210		217,040	—	6,169	1
2017	241,634		239,229	—	2,402	3
Prior	378,212		361,319	—	16,342	551
Revolving loans	463,505		436,725	—	26,762	18

Total	$	3,100,584	3,011,375	—	88,632	577


	December 31, 2020
(Dollars in thousands)	Total		Pass	Special Mention	Substandard	Doubtful/ Loss
Commercial real estate loans
Term loans by origination year
2020	$	1,496,094	1,490,947	—	5,147	—
2019	1,077,461		1,069,503	—	7,958	—
2018	914,506		874,673	—	39,833	—
2017	723,448		696,371	—	27,077	—
2016	496,275		481,392	—	14,883	—
Prior	1,488,281		1,450,596	—	37,574	111
Revolving loans	119,830		116,548	—	3,282	—

Total	$	6,315,895	6,180,030	—	135,754	111
Other commercial loans 1
Term loans by origination year
2020	$	1,366,664	1,341,316	19,564	5,784	—
2019	304,430		284,981	12,582	6,864	3
2018	241,222		234,988	—	6,233	1
2017	269,857		264,651	—	5,114	92
2016	179,225		177,164	—	2,056	5
Prior	218,306		206,431	—	11,329	546
Revolving loans	475,113		467,929	54	7,112	18

Total	$	3,054,817	2,977,460	32,200	44,492	665

For residential real estate, home equity and other consumer loan segments, the Company evaluates credit quality primarily on the aging status of the loan. The following tables present the amortized cost in residential real estate, home equity and other consumer loans based on payment performance:


	March 31, 2021
(Dollars in thousands)	Total		Performing	30-89 Days Past Due	Non-Accrual and 90 Days or More Past Due
Residential real estate loans
Term loans by origination year
2021 (year-to-date)	$	37,080	36,673	407	—
2020	220,196		219,651	545	—
2019	133,625		133,269	356	—
2018	83,079		82,095	750	234
2017	65,036		64,227	809	—
Prior	203,795		197,805	2,760	3,230
Revolving loans	2,286		2,286	—	—

Total	$	745,097	736,006	5,627	3,464
Home equity loans
Term loans by origination year
2021 (year-to-date)	$	18	18	—	—
2020	71		71	—	—
2019	672		637	—	35
2018	1,162		1,162	—	—
2017	1,015		989	—	26
Prior	12,868		11,890	520	458
Revolving loans	609,563		606,083	1,168	2,312

Total	$	625,369	620,850	1,688	2,831
Other consumer loans
Term loans by origination year
2021 (year-to-date)	$	48,670	48,652	—	18
2020	114,926		114,701	173	52
2019	57,385		56,947	145	293
2018	36,830		36,469	168	193
2017	13,154		13,093	10	51
Prior	25,409		24,347	784	278
Revolving loans	27,804		27,381	21	402

Total	$	324,178	321,590	1,301	1,287