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Subordinated Debentures and Convertible Notes - Narrative (Details)
 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 07, 2018
$ / shares
Sep. 30, 2022
USD ($)
grantorTrust
Sep. 30, 2021
USD ($)
Jun. 30, 2022
Sep. 30, 2022
USD ($)
grantorTrust
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Jun. 06, 2018
USD ($)
Subordinated Borrowing [Line Items]                
Number of wholly owned subsidiary grantor trusts | grantorTrust   9     9      
Amount of pooled trust preferred securities issued   $ 126,000,000     $ 126,000,000      
Right to defer consecutive payments of interest, maximum term         5 years      
Carrying value of Debentures   106,258,000     $ 106,258,000   $ 105,354,000  
Interest on other borrowings and convertible notes   2,936,000 $ 2,290,000   7,878,000 $ 6,892,000    
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Additional paid-in capital                
Subordinated Borrowing [Line Items]                
Adjustments to additional paid in capital, equity component of convertible debt, net of tax   18,300,000            
Other assets                
Subordinated Borrowing [Line Items]                
Investment in common trust securities   3,900,000     3,900,000   3,900,000  
Carrying Value of Debentures                
Subordinated Borrowing [Line Items]                
Carrying value of Debentures   106,258,000     106,258,000   105,400,000  
Remaining discounts on acquired Debentures   23,600,000     23,600,000   $ 24,500,000  
Trust Preferred Securities Subject to Mandatory Redemption                
Subordinated Borrowing [Line Items]                
Amount of pooled trust preferred securities issued   $ 126,000,000     $ 126,000,000      
Percent included in tier one capital, maximum   25.00%     25.00%      
Excess of percent threshold included in tier two capital   25.00%     25.00%      
Convertible Notes                
Subordinated Borrowing [Line Items]                
Aggregate principal amount issued   $ 217,500,000     $ 217,500,000     $ 217,500,000
Interest rate               2.00%
Initial conversion rate 0.0450760       0.0450760      
Initial conversion price (in dollars per share) | $ / shares $ 22.18              
Premium percentage to closing stock price on date of pricing of the notes 22.50%              
Call option, percentage of principal amount in cash 100.00%              
Repurchase or put option, percentage of principal amount in cash 100.00%              
Interest expense on convertible notes   $ 1,300,000 $ 1,300,000   $ 4,000,000 $ 4,000,000    
Number of outstanding years for which non-cash interest expense and issuance cost capitalization expense will be recorded 5 years     5 years 5 years      
Convertible Notes | Discount Rate                
Subordinated Borrowing [Line Items]                
Discount rate 0.0425