Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financial assets:
Investment securities - available for sale	$ 728,738	$ 1,174,964
Investment securities, trading	8,266	8,623
Investment securities – held to maturity	12,761	15,186
Carrying Amount
Financial assets:
Investment securities - available for sale	728,738	1,174,964
Investment securities, trading	8,266	8,623
Total financial assets	4,568,299	5,038,076
Financial liabilities:
Total financial liabilities	4,275,288	4,768,821
Fair Value
Financial assets:
Investment securities - available for sale	728,738	1,174,964
Investment securities, trading	8,266	8,623
Total financial assets	4,503,163	4,953,129
Financial liabilities:
Total financial liabilities	4,266,479	4,769,852
Level 1 | Carrying Amount
Financial assets:
Cash and cash equivalents	113,899	96,313
Level 1 | Fair Value
Financial assets:
Cash and cash equivalents	113,899	96,313
Level 2 | Carrying Amount
Financial assets:
Investment securities – held to maturity	12,532	14,759
Loans held for sale	653	6,000
Financial liabilities:
Deposits	3,959,745	4,376,254
Short-term borrowings	21,553	72,161
Long-term FHLB advances	39,976	39,906
Subordinated notes	98,973	98,883
Junior subordinated debentures	22,030	21,935
Level 2 | Carrying Amount | Interest rate swaps
Financial assets:
Derivative assets	87,483	113,848
Financial liabilities:
Derivative liabilities	87,483	113,848
Level 2 | Carrying Amount | FX forwards
Financial assets:
Derivative assets	20	52
Financial liabilities:
Derivative liabilities	3	70
Level 2 | Carrying Amount | RPAs purchased
Financial assets:
Derivative assets	230	342
Level 2 | Carrying Amount | RPAs sold
Financial liabilities:
Derivative liabilities	18	30
Level 2 | Fair Value
Financial assets:
Investment securities – held to maturity	12,761	15,186
Loans held for sale	653	6,000
Financial liabilities:
Deposits	3,960,432	4,379,021
Short-term borrowings	21,553	72,161
Long-term FHLB advances	40,171	40,441
Subordinated notes	91,800	90,735
Junior subordinated debentures	19,512	27,812
Level 2 | Fair Value | Interest rate swaps
Financial assets:
Derivative assets	87,483	113,848
Financial liabilities:
Derivative liabilities	87,483	113,848
Level 2 | Fair Value | FX forwards
Financial assets:
Derivative assets	20	52
Financial liabilities:
Derivative liabilities	3	70
Level 2 | Fair Value | RPAs purchased
Financial assets:
Derivative assets	230	342
Level 2 | Fair Value | RPAs sold
Financial liabilities:
Derivative liabilities	18	30
Level 3 | Carrying Amount
Financial assets:
Net portfolio loans and leases	3,578,248	3,574,702
MSRs	2,173	2,626
Other assets	36,057	45,847
Financial liabilities:
Other liabilities	45,507	45,734
Level 3 | Fair Value
Financial assets:
Net portfolio loans and leases	3,512,883	3,489,322
MSRs	2,173	2,632
Other assets	36,057	45,847
Financial liabilities:
Other liabilities	$ 45,507	$ 45,734