XML 72 R91.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
COMMITMENTS AND CONTINGENCIES (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Commitments and Contingencies Disclosure [Line Items]      
Reserves for unfunded commitments $ 600,000 $ 700,000  
Commitments outstanding to extend credit 0 0  
Loans and Leases Receivable, Commitments, Fixed Rates 123,700,000 174,000,000.0  
Loans and Leases Receivable, Commitments, Variable Rates $ 3,200,000,000 $ 2,900,000,000  
Loan Commitments, Fixed Interest Rate Range, Minimum 0.00%    
Loan Commitments, Fixed Interest Rate Range, Maximum 21.00%    
Loan Commitments, Fixed Rate, Maturities, Minimum 1 year 1 year  
Loan Commitments, Fixed Rate, Maturities, Maximum 31 years 7 months 6 days 30 years  
Letters of credit issued to guarantee performance of a client to a third party $ 33,400,000 $ 32,700,000  
Affordable Housing Program Obligation 38,500,000 39,400,000  
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 10,075,000 5,439,000 $ 16,806,000
Amortization Method Qualified Affordable Housing Project Investments, Amortization 6,900,000 5,700,000 4,200,000
Affordable housing contingent commitment 0 0  
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets 3,100,000 3,900,000  
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 5,100,000 3,900,000  
Estimated Litigation Liability 0 0  
Commitments to Extend Credit      
Commitments and Contingencies Disclosure [Line Items]      
Commitments outstanding to extend credit 3,300,000,000 3,000,000,000.0  
Minimum      
Commitments and Contingencies Disclosure [Line Items]      
Loans and Leases Receivable, Commitments, Variable Rates   0.0000  
Maximum      
Commitments and Contingencies Disclosure [Line Items]      
Loans and Leases Receivable, Commitments, Variable Rates   0.2100  
Affordable housing investment [Member]      
Commitments and Contingencies Disclosure [Line Items]      
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 6,200,000 4,900,000 3,200,000
Historic tax credit [Member]      
Commitments and Contingencies Disclosure [Line Items]      
Effective Income Tax Rate Reconciliation, Tax Credit, Amount $ 3,500,000 $ 500,000 $ 13,700,000