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Commitments and Contingencies - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Apr. 08, 2019
office
Unrecorded Unconditional Purchase Obligation        
Operating leases, rent expense $ 4.8 $ 3.2 $ 2.5  
Construction Contracts        
Unrecorded Unconditional Purchase Obligation        
Commitments under construction contracts $ 2.1      
Related Entity        
Unrecorded Unconditional Purchase Obligation        
Ownership percentage in partnership 50.00%      
Idaho Independent Bank [Member]        
Unrecorded Unconditional Purchase Obligation        
Number of banking offices | office       11
Community 1st Bank [Member]        
Unrecorded Unconditional Purchase Obligation        
Number of banking offices | office       3
Mortgage loans originated for sale        
Unrecorded Unconditional Purchase Obligation        
Guarantor Obligations, Current Carrying Value $ 0.9 $ 1.5