Annual report pursuant to Section 13 and 15(d)

Loans Receivable - Additional Information (Detail)

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Loans Receivable - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2021
USD ($)
Property
Dec. 31, 2020
USD ($)
Property
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable $ 5,151,541,000 $ 4,880,168,000  
Accrued interest on loans 11,976,000 16,363,000  
Loans pledged to secure advances 2,300,000,000 2,170,000,000  
Loans held for sale, at the lower of cost or fair value 13,342,000 8,568,000 $ 6,020,000
Gains on sale of second draw PPP loans 17,266,000 5,247,000 $ 5,251,000
Proceeds from sale of second draw PPP loans 261,853,000 69,052,000  
Loans 90 days or more past due and still accruing $ 0 $ 0  
Number of real estate properties | Property 1 4  
Other real estate owned ("OREO") $ 675,000 $ 2,360,000  
Reserves relating to loans included in allowance for credit losses $ 4,000 16,000  
Loans default payment past due period 30 days    
Total recorded investment $ 0 398,000  
Allowance for credit losses resulting from defaulted loans 0 3,000  
60-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable 11,100,000 53,400,000  
Pass/Pass-Watch      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable 4,995,614,000 4,663,021,000  
Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable 95,294,000 76,978,000  
Classified      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable 60,633,000 140,169,000  
Loans | Accrued Interest      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued interest on loans 10,100,000 15,200,000  
Unpaid deferred interest receivable related to loans modified under CARES Act 3,400,000 7,500,000  
Unpaid deferred interest receivable related to loans modified under CARES Act, net of valuation allowance 0 1,700,000  
Payment Protection Program      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable 3,000,000.0 295,700,000  
Loans Modified under provision of CARES Act 2,300,000 155,600,000  
Payment Protection Program | 60-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Modified under provision of CARES Act 5,000,000    
Loans previously modified under provision of CARES Act 1,100,000 1,700,000  
Payment Protection Program | 30-59 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Modified under provision of CARES Act 47,000,000 155,600,000  
Loans previously modified under provision of CARES Act 1,200,000 4,900,000  
Payment Protection Program | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Modified under provision of CARES Act 0    
Loans previously modified under provision of CARES Act 1,100,000 13,900,000  
Payment Protection Program | Pass/Pass-Watch      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Modified under provision of CARES Act 1,100,000 99,900,000  
Payment Protection Program | Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Modified under provision of CARES Act 0 31,300,000  
Payment Protection Program | Classified      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Modified under provision of CARES Act 1,200,000 24,400,000  
SBA Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale, at the lower of cost or fair value 13,300,000 8,600,000  
PPP Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale, at the lower of cost or fair value 0    
Gains on sale of second draw PPP loans 3,000,000.0    
Proceeds from sale of second draw PPP loans $ 132,700,000 $ 0