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Loans and Leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans and Leases Receivable, Gross $ 23,026,308 $ 19,153,357    
Loans and Leases Receivable, Deferred Income (84,760) (69,980)    
Loans held for investment, net 22,941,548 19,083,377    
Loans and Leases Receivable, Allowance (200,564) (348,181) $ (142,402) $ (138,785)
Total loans and leases held for investment, net 22,740,984 18,735,196    
Loans and Finance Receivables        
Financing Receivable, Credit Quality Indicator [Line Items]        
Interest Receivable 80,300 79,700    
Mortgages [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans and Leases Receivable, Gross 11,189,278 7,905,193    
Loans held for investment, net 11,178,720 7,899,936    
Loans and Leases Receivable, Allowance (98,053)   (49,883) (44,575)
Real Estate Construction [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans and Leases Receivable, Gross 3,491,340 3,393,145    
Loans held for investment, net 3,437,127 3,360,281    
Loans and Leases Receivable, Allowance (45,079)   (21,952) (30,544)
Commercial Portfolio Segment [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans and Leases Receivable, Gross 7,888,068 7,534,801    
Loans held for investment, net 7,868,051 7,502,905    
Loans and Leases Receivable, Allowance (48,718)   (68,388) (61,528)
Consumer Portfolio Segment [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans and Leases Receivable, Gross 457,622 320,218    
Loans held for investment, net 457,650 $ 320,255    
Loans and Leases Receivable, Allowance $ (8,714)   $ (2,179) $ (2,138)