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Business Combinations - Additional Information (Details)
$ in Thousands
 3 Months Ended
Jan. 01, 2020
USD ($)
Jan. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Property
Capital Bank      
Business Acquisition [Line Items]      
Purchase accounting adjustments, assets   $ 494,416  
Purchase accounting adjustments, loans   307,300  
Purchase accounting adjustments, deposits   449,018  
Total consideration paid   76,834  
Cash consideration   353  
Core deposit intangible   $ 2,662 $ 2,700
Two River Bancorp Inc.      
Business Acquisition [Line Items]      
Purchase accounting adjustments, assets $ 1,112,584    
Purchase accounting adjustments, loans 940,836    
Purchase accounting adjustments, deposits 941,750    
Total consideration paid 197,050    
Cash consideration 48,400    
Core deposit intangible 12,130   12,100
Country Bank Holding Company, Inc      
Business Acquisition [Line Items]      
Purchase accounting adjustments, assets 792,897    
Purchase accounting adjustments, loans 618,661    
Purchase accounting adjustments, deposits 652,653    
Total consideration paid 112,836    
Core deposit intangible $ 2,117   $ 2,100
Core Deposits      
Business Acquisition [Line Items]      
Acquired finite-lived intangible assets, weighted average useful life     10 years
Capital Bank      
Business Acquisition [Line Items]      
Number of properties subject to lease agreement | Property     1
Two River Bancorp Inc.      
Business Acquisition [Line Items]      
Number of properties subject to lease agreement | Property     14
Country Bank Holding Company, Inc      
Business Acquisition [Line Items]      
Number of properties subject to lease agreement | Property     5