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Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities $ 10,415 $ 12,541
Loans, net of allowance of loan losses 3,653,288 3,347,583
Time deposits [1] 1,255,108 1,015,095
FHLB advances 950,722 791,356
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 10,415 12,541
Loans, net of allowance of loan losses 3,653,288 3,347,583
Time deposits 1,255,108 1,015,095
FHLB advances 950,722 791,356
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 10,316 12,721
Loans, net of allowance of loan losses 3,598,025 3,369,932
Time deposits 1,269,433 1,018,396
FHLB advances 950,691 792,887
Junior subordinated debentures 19,226 18,559
Estimate of Fair Value Measurement [Member] | Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities 0 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 10,316 12,721
Loans, net of allowance of loan losses 0 0
Time deposits 1,269,433 1,018,396
FHLB advances 950,691 792,887
Junior subordinated debentures 19,226 18,559
Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities 0 0
Loans, net of allowance of loan losses 3,598,025 3,369,932
Time deposits 0 0
FHLB advances 0 0
Junior subordinated debentures $ 0 $ 0
[1] Includes wholesale brokered time deposits.