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Disclosures about Fair Value of Assets and Liabilities - Qualitative Information about Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements, Other than Goodwill (Detail) - Significant Unobservable Inputs (Level 3) [Member] $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($) ConsecutivePayment	Dec. 31, 2018 USD ($) ConsecutivePayment
Impaired Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value | $	$ 7,288	$ 5,661
Valuation Technique	Collateral based measurement	Collateral based measurement
Impaired loans	Discount to reflect current  marketconditions and ultimatecollectability	Discount to reflect current marketconditions and ultimate collectability
Mortgage Servicing Rights [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value | $	$ 14,114	$ 12,349
Valuation Technique	Discounted cash flows	Discounted cash flows
Impaired loans	Discount rate,Constant prepayment rate,Probability of default	Discount rate,Constant prepayment rate,Probability of default
Minimum [Member] | Impaired Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	0.00%	0.00%
Minimum [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Discount Rate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable inputs	9.7	10.2
Minimum [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Constant Prepayment Rate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable inputs	10.0	9.1
Minimum [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Default Rate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable inputs	0.0	0.1
Maximum [Member] | Impaired Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	100.00%	100.00%
Maximum [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Discount Rate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable inputs	10.0	11.0
Maximum [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Constant Prepayment Rate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable inputs	22.7	21.9
Maximum [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Default Rate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable inputs	1.5	2.8
Weighted Average [Member] | Impaired Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	11.10%	15.50%
Weighted Average [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Discount Rate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable inputs	9.8	10.3
Weighted Average [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Constant Prepayment Rate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable inputs	11.3	9.3
Weighted Average [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Default Rate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable inputs	0.6	0.6

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
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