Business Combination and Asset Purchase - Additional Information (Detail)					3 Months Ended				9 Months Ended		12 Months Ended
	Oct. 01, 2021 USD ($) Office $ / shares shares	Apr. 30, 2021 USD ($) Office $ / shares shares	Nov. 16, 2020 USD ($) shares	Jan. 01, 2019 USD ($) Office $ / shares shares	Sep. 30, 2022 USD ($) Loan shares	Jun. 30, 2022 USD ($) Loan	Mar. 31, 2022 USD ($) Loan	Dec. 31, 2021 USD ($) Loan shares	Sep. 30, 2022 USD ($) shares	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) shares	Nov. 30, 2020 USD ($) Client
Business Acquisition [Line Items]
Common stock, shares outstanding | shares					14,063,999			14,063,999	14,063,999		14,063,999
Goodwill					$ 80,434,000			$ 80,434,000	$ 80,434,000		$ 80,434,000
Pro-forma operating revenue, net of tax					2,900,000				7,500,000
Amortization expense									597,000	$ 478,000
Core Deposits [Member]
Business Acquisition [Line Items]
Amortization expense									597,000	478,000
Amortization expense for 2022					795,000				795,000
Customer Lists [Member]
Business Acquisition [Line Items]
Amortization expense									92,000	$ 92,000
Amortization expense for 2022					123,000				123,000
Perpetual Federal Savings Bank [Member]
Business Acquisition [Line Items]
Number of full-service offices | Office	1
Common stock issued in exchange of each outstanding share	1.7766
Cash payment for exchange of each share | $ / shares	$ 41.20
Business acquisition share owned subject to adjustment | shares	1,833,999
Common stock, shares outstanding | shares	2,470,032
Share price | $ / shares	$ 22.40
Total consideration for acquisition	$ 100,312,000
Cash paid for the capital stock	59,234,000
Stock issued for acquisition	41,078,000
Goodwill	25,220,000
Fair value of assets acquired					334,700,000				334,700,000
Gross principal and contractual interest					403,300,000				403,300,000
Acquisition expected to be uncollectible					5,600,000				$ 5,600,000
Loan receivable weighted average life									52 months
Business combination, premises and equipment written down value									$ 4,000
Business combination, average remaining life									16 years 2 months 12 days
Fair value for certificate of deposit, valuation amount					3,900,000				$ 3,900,000
Fair value for certificate of deposit, amortization period									1 year 7 months 6 days
Fair value of Federal Home Loan Bank (FHLB) advances, valuation amount					218,000				$ 218,000
Fair value of Federal Home Loan Bank (FHLB) advances, amortization period									2 years 7 months 6 days
Fair value adjustment of loans acquired and accounted	237,000				$ 141,000			$ 190,000	$ 141,000		190,000
Number of commercial purchased credit impaired loans paid off | Loan								2
Number of consumer purchased credit impaired loans paid off | Loan					1	2	1	1
Discount recognized at acquisition related to commercial purchased credit-impaired loans					$ 1,000	$ 36,000	$ 12,000				47,000
Perpetual Federal Savings Bank [Member] | Building [Member]
Business Acquisition [Line Items]
Business combination, premises and equipment written down value									297,000
Perpetual Federal Savings Bank [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Recognition of core deposit intangible asset with acquired purchase	$ 668,000
Remaining economic useful life	7 years
Amortization expense for 2022					95,000				95,000
Ossian State Bank [Member]
Business Acquisition [Line Items]
Number of full-service offices | Office		2
Ossian State Bank [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Recognition of core deposit tangible asset with acquired purchase									980,200
Ossian Financial Services, Inc. [Member]
Business Acquisition [Line Items]
Cash payment for exchange of each share | $ / shares		$ 67.71
Common stock, shares outstanding | shares		295,388
Total consideration for acquisition		$ 20,001,000
Cash paid for the capital stock		20,001,000
Goodwill		7,874,000
Fair value of assets acquired					52,400,000				52,400,000
Gross principal and contractual interest					63,700,000				63,700,000
Acquisition expected to be uncollectible					1,100,000				$ 1,100,000
Loan receivable weighted average life									52 months
Business combination, premises and equipment written down value									$ 596,000
Business combination, average remaining life									39 years
Fair value for certificate of deposit, valuation amount					59,000				$ 59,000
Fair value for certificate of deposit, amortization period									1 year 4 months 24 days
Fair value adjustment of loans acquired and accounted		$ 325,000			$ 10,000			$ 321,000	$ 10,000		$ 321,000
Number of consumer purchased credit impaired loans paid off | Loan					6
Discount recognized at acquisition related to commercial purchased credit-impaired loans					$ 311,000
Goodwill deductible for tax purpose, period		15 years
Ossian Financial Services, Inc. [Member] | Building [Member]
Business Acquisition [Line Items]
Business combination, premises and equipment written down value									244,000
Ossian Financial Services, Inc. [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Recognition of core deposit intangible asset with acquired purchase		$ 980,200
Remaining economic useful life		7 years
Amortization expense for 2022					140,000				140,000
Bank of Geneva [Member]
Business Acquisition [Line Items]
Number of full-service offices | Office				6
Bank of Geneva [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Recognition of core deposit intangible asset with acquired purchase									$ 3,900,000
Remaining economic useful life									7 years
Limberlost Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Cash payment for exchange of each share | $ / shares				$ 8,465.00
Common stock, shares outstanding | shares				1,000
Share price | $ / shares				$ 38.49
Total consideration for acquisition				$ 78,900,000
Cash paid for the capital stock				8,500,000
Stock issued for acquisition				70,400,000
Goodwill				$ 43,300,000
Common stock issued in exchange of each outstanding share | shares				1,830,000
Limberlost Bancshares, Inc. [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Recognition of core deposit intangible asset with acquired purchase				$ 3,900,000
Remaining economic useful life				7 years
Perpetual Federal Savings Bank [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Recognition of core deposit tangible asset with acquired purchase									$ 668,000
Adams County Financial Resources [Member]
Business Acquisition [Line Items]
Total consideration for acquisition			$ 825,000
Common stock issued in exchange of each outstanding share | shares			40,049
Assets under management amount												$ 83,000,000
Number of clients assets under management | Client												450
Adams County Financial Resources [Member] | Customer Lists [Member]
Business Acquisition [Line Items]
Recognition of core deposit intangible asset with acquired purchase			$ 800,000
Remaining economic useful life			6 years 6 months
Amortization expense for 2022					$ 123,000				$ 123,000