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Subordinated Debentures and Convertible Notes - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 07, 2018
$ / shares
Jun. 30, 2023
USD ($)
grantorTrust
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
grantorTrust
Jun. 30, 2022
USD ($)
Dec. 31, 2022
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   107,188,000   $ 107,188,000   $ 106,565,000  
Interest on other borrowings and debt   3,149,000 $ 2,609,000 6,902,000 $ 4,942,000    
Debt Instrument, Repurchased Face Amount       19,534,000 0    
Gain on debt extinguishment   169,000   405,000 0    
Repayment of Convertible Debt, Principal   9,200,000   19,900,000      
Repayments of Debt       (197,107,000) 0    
Other assets              
Subordinated Borrowing [Line Items]              
Investment in common trust securities   3,900,000   3,900,000   3,900,000  
Carrying Value of Subordinated Debentures              
Subordinated Borrowing [Line Items]              
Carrying value of Debentures   107,188,000   107,188,000   106,600,000  
Remaining discounts on acquired Debentures   22,700,000   22,700,000   $ 23,300,000  
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   $ 598,000 $ 1,300,000 $ 1,900,000 $ 2,600,000    
Number of outstanding years for which non-cash interest expense and issuance cost capitalization expense will be recorded   5 years   5 years   5 years