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Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, net of allowance for credit losses on loans $ 4,151,884 $ 3,865,985
Time deposits [1] 1,296,396 1,069,323
FHLB advances 593,859 1,141,464
Junior subordinated debentures 22,681 22,681
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, net of allowance for credit losses on loans 4,151,884 3,865,985
Time deposits 1,296,396 1,069,323
FHLB advances 593,859 1,141,464
Junior subordinated debentures 22,681 22,681
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, net of allowance for credit losses on loans 4,114,628 3,869,192
Time deposits 1,302,128 1,082,830
FHLB advances 602,000 1,145,242
Junior subordinated debentures 19,422 19,628
Estimate of Fair Value Measurement [Member] | Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, net of allowance for credit losses on loans 0 0
Time deposits 0 0
FHLB advances 0 0
Junior subordinated debentures 0 0
Estimate of Fair Value Measurement [Member] | Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, net of allowance for credit losses on loans 0 0
Time deposits 1,302,128 1,082,830
FHLB advances 602,000 1,145,242
Junior subordinated debentures 19,422 19,628
Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, net of allowance for credit losses on loans 4,114,628 3,869,192
Time deposits 0 0
FHLB advances 0 0
Junior subordinated debentures $ 0 $ 0
[1] Includes wholesale brokered time deposit balances of $591,541 and $284,842, respectively, as of December 31, 2020 and December 31, 2019.