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Loans - Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount of recorded investment	$ 814,030	$ 771,309
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount of recorded investment	124,785	86,035
Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Amount of recorded investment	7,569	7,623
Performing | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount of recorded investment	809,247	765,823
Performing | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount of recorded investment	123,950	85,322
Performing | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Amount of recorded investment	7,567	7,618
Nonperforming | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount of recorded investment	4,783	5,486
Nonperforming | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount of recorded investment	835	713
Nonperforming | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Amount of recorded investment	$ 2	$ 5

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+ References

No definition available.

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- Definition

Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

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