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Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities, amortized cost $ 0 $ 10,415
Loans, net of allowance of loan losses 3,865,985 3,653,288
Time deposits [1] 1,069,323 1,255,108
FHLB advances 1,141,464 950,722
Junior subordinated debentures 22,681 22,681
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities, amortized cost   10,415
Loans, net of allowance of loan losses 3,865,985 3,653,288
Time deposits 1,069,323 1,255,108
FHLB advances 1,141,464 950,722
Junior subordinated debentures 22,681 22,681
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities, amortized cost   10,316
Loans, net of allowance of loan losses 3,869,192 3,598,025
Time deposits 1,082,830 1,269,433
FHLB advances 1,145,242 950,691
Junior subordinated debentures 19,628 19,226
Estimate of Fair Value Measurement [Member] | Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities, amortized cost   0
Loans, net of allowance of loan losses 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]    
Held to maturity securities, amortized cost   10,316
Loans, net of allowance of loan losses 0 0
Time deposits 1,082,830 1,269,433
FHLB advances 1,145,242 950,691
Junior subordinated debentures 19,628 19,226
Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities, amortized cost   0
Loans, net of allowance of loan losses 3,869,192 3,598,025
Time deposits 0 0
FHLB advances 0 0
Junior subordinated debentures $ 0 $ 0
[1]
Includes wholesale brokered time deposits.