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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Significant Accounting Policies [Line Items]      
Days past due when loans are generally charged-off in full, in days   120 days  
Other real estate owned   $ 468 $ 230
FHLB stock   14,600 20,300
FRB stock   6,100 6,100
Equity method investments, asset amount   $ 7,600 6,000
Number of consecutive years used for compensation calculation   5 years  
Reclassification from AOCI to retained earnings $ 2,800    
Reclassification of qualified investment securities from HTM to AFS     (710)
ASU 2016-02 [Member]      
Significant Accounting Policies [Line Items]      
Cumulative-effect adjustment on assets 22,700    
Cumulative-effect adjustment on liabilities $ 23,400    
ASU 2017-12 [Member]      
Significant Accounting Policies [Line Items]      
Reclassification of qualified investment securities from HTM to AFS   $ 26,200  
Other Assets [Member]      
Significant Accounting Policies [Line Items]      
Tax credit investments   $ 16,500 $ 4,500
Core Deposits [Member]      
Significant Accounting Policies [Line Items]      
Estimated average life   9 years 6 months  
Other Intangible Assets [Member]      
Significant Accounting Policies [Line Items]      
Estimated average life   20 years  
Minimum [Member]      
Significant Accounting Policies [Line Items]      
Standby letters of credit outstanding original term, in years   1 year  
Loss rate look-back period   24 months  
Loss emergence period   12 months  
Financing receivable increase in reserves of credit loss percentage   15.00%  
Minimum [Member] | Building And Building Improvements [Member]      
Significant Accounting Policies [Line Items]      
Premise and equipment, estimated useful lives, in years   15 years  
Minimum [Member] | Software, Furniture And Equipment [Member]      
Significant Accounting Policies [Line Items]      
Premise and equipment, estimated useful lives, in years   3 years  
Maximum [Member]      
Significant Accounting Policies [Line Items]      
Standby letters of credit outstanding original term, in years   5 years  
Loss emergence period   32 months  
Financing receivable increase in reserves of credit loss percentage   30.00%  
Maximum [Member] | Building And Building Improvements [Member]      
Significant Accounting Policies [Line Items]      
Premise and equipment, estimated useful lives, in years   39 years  
Maximum [Member] | Software, Furniture And Equipment [Member]      
Significant Accounting Policies [Line Items]      
Premise and equipment, estimated useful lives, in years   10 years