Business Combination and Asset Purchase - Additional Information (Detail)					3 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	Mar. 31, 2022 USD ($) Loan shares	Dec. 31, 2021 USD ($) Loan shares	Mar. 31, 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
Goodwill					$ 80,434,000	$ 80,434,000		$ 80,434,000
Pro-forma operating revenue, net of tax					2,100,000
Amortization expense					199,000		$ 140,000
Core Deposits [Member]
Business Acquisition [Line Items]
Amortization expense					199,000		140,000
Amortization expense for 2022					795,000
Customer Lists [Member]
Business Acquisition [Line Items]
Amortization expense					31,000		$ 31,000
Amortization expense for 2022					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 acquisition	59,234,000
Stock issued for acquisition	41,078,000
Goodwill	25,220,000
Fair value of assets acquired					334,700,000
Gross principal and contractual interest					403,300,000
Acquisition expected to be uncollectible					$ 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
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
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				$ 177,000	$ 190,000		190,000
Number of commercial purchased credit impaired loans paid off | Loan						2
Number of consumer purchased credit impaired loans paid off | Loan					1	1
Discount recognized at acquisition related to commercial purchased credit-impaired loans					$ 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
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 acquisition		20,001,000
Goodwill		7,874,000
Fair value of assets acquired					52,400,000
Gross principal and contractual interest					63,700,000
Acquisition expected to be uncollectible					$ 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
Fair value for certificate of deposit, amortization period					1 year 4 months 24 days
Fair value adjustment of loans acquired and accounted		$ 325,000			$ 321,000	$ 321,000		$ 321,000
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
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 acquisition				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