Loans - Schedule of Potential COVID-19 Risk Concentrations for Commercial and Commercial Real Estate Loans by Industry Type (Detail) - USD ($)	Jun. 30, 2020	Jun. 30, 2019
Financing Receivable Modifications [Line Items]
Balance	$ 0	$ 0
CARES Act [Member]
Financing Receivable Modifications [Line Items]
Balance	431,283,000
CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	47,686,000
CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	91,831,000
CARES Act [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	234,543,000
CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	374,060,000
Administration and Support [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	365,000
Administration and Support [Member] | CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	952,000
Administration and Support [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	1,317,000
Agriculture [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	153,000
Agriculture [Member] | CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	811,000
Agriculture [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	964,000
Construction [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	3,895,000
Construction [Member] | CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	298,000
Construction [Member] | CARES Act [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	1,370,000
Construction [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	5,563,000
Education [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	74,000
Education [Member] | CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	2,363,000
Education [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	2,437,000
Entertainment and Recreation [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	3,102,000
Entertainment and Recreation [Member] | CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	26,638,000
Entertainment and Recreation [Member] | CARES Act [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	5,151,000
Entertainment and Recreation [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	34,891,000
Health Care [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	3,226,000
Health Care [Member] | CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	11,523,000
Health Care [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	14,749,000
Hotels [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	1,802,000
Hotels [Member] | CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	979,000
Hotels [Member] | CARES Act [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	52,309,000
Hotels [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	55,090,000
Information, Finance and Insurance [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	175,000
Information, Finance and Insurance [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	175,000
Manufacturing [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	6,192,000
Manufacturing [Member] | CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	2,068,000
Manufacturing [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	8,260,000
Other Services [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	4,490,000
Other Services [Member] | CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	9,319,000
Other Services [Member] | CARES Act [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	3,421,000
Other Services [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	17,230,000
Professional and Management [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	250,000
Professional and Management [Member] | CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	394,000
Professional and Management [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	644,000
Real Estate [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	590,000
Real Estate [Member] | CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	15,631,000
Real Estate [Member] | CARES Act [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	168,606,000
Real Estate [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	184,827,000
Restaurants [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	17,818,000
Restaurants [Member] | CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	12,998,000
Restaurants [Member] | CARES Act [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	3,042,000
Restaurants [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	33,858,000
Retail [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	3,838,000
Retail [Member] | CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	4,637,000
Retail [Member] | CARES Act [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	644,000
Retail [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	9,119,000
Transportation and Warehousing [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	216,000
Transportation and Warehousing [Member] | CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	542,000
Transportation and Warehousing [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	758,000
Wholesalers [Member] | CARES Act [Member] | Commercial and Agriculture [Member]
Financing Receivable Modifications [Line Items]
Balance	1,500,000
Wholesalers [Member] | CARES Act [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Balance	2,678,000
Wholesalers [Member] | CARES Act [Member] | Commercial and Commercial Real Estate Loans [Member]
Financing Receivable Modifications [Line Items]
Balance	$ 4,178,000