Annual report pursuant to Section 13 and 15(d)

Loans and Leases - Additional Information (Detail)

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Loans and Leases - Additional Information (Detail)
12 Months Ended
Dec. 31, 2019
USD ($)
Property
Dec. 31, 2018
USD ($)
Property
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable $ 11,742,000 $ 13,331,000
Loans and leases receivable pledged to secure advances 1,350,000,000 1,100,000,000
Loans 90 days or more past due and still accruing $ 0 $ 4,000
Number of real estate properties | Property 2 7
Other real estate owned ("OREO") $ 63,000 $ 663,000
TDR loans receivable $ 56,300,000 10,300,000
Principal and interest due 6 months  
Reserves relating to loans included in allowance for loan and lease losses $ 22,700,000 300,000
Loans default payment past due period 30 days  
Total recorded investment $ 132,000 132,000
Loans and lease receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable $ 10,000,000.0 $ 10,900,000