Fair Value Accounting and Measurement (Carrying Amounts and Estimated Fair Values of Selected Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Interest-earning deposits with banks	$ 671,300	$ 434,867
Debt Securities, Available-for-sale	5,910,999	5,210,134
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	2,148,327	0
Debt Securities, Held-to-maturity, Fair Value	2,122,606	0
Estimate of Fair Value Measurement
Assets
Cash and due from banks	153,414	218,899
Interest-earning deposits with banks	671,300	434,867
Debt Securities, Available-for-sale	5,910,999	5,210,134
Debt Securities, Held-to-maturity, Fair Value	2,122,606
FHLB stock	10,280	10,280
Loans held for sale	9,774	26,481
Loans	10,679,349	9,720,592
Liabilities
Time Deposits	430,682	338,815
FHLB Advances and FRB Borrowings	8,752	9,295
Repurchase agreements	86,013	73,859
Subordinated Debentures	10,125	35,414
Junior Subordinated Notes	9,927
Carrying Amount
Assets
Cash and due from banks	153,414	218,899
Interest-earning deposits with banks	671,300	434,867
Debt Securities, Available-for-sale	5,910,999	5,210,134
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	2,148,327
FHLB stock	10,280	10,280
Loans held for sale	9,774	26,481
Loans	10,486,359	9,278,520
Liabilities
Time Deposits	445,957	338,845
FHLB Advances and FRB Borrowings	7,359	7,414
Repurchase agreements	86,013	73,859
Subordinated Debentures	10,000	35,092
Junior Subordinated Notes	10,310
Fair Value, Inputs, Level 1 | Estimate of Fair Value Measurement
Assets
Cash and due from banks	153,414	218,899
Interest-earning deposits with banks	671,300	434,867
Debt Securities, Available-for-sale	157,536	0
Debt Securities, Held-to-maturity, Fair Value	0
FHLB stock	0	0
Loans held for sale	0	0
Loans	0	0
Liabilities
Time Deposits	0	0
FHLB Advances and FRB Borrowings	0	0
Repurchase agreements	0	0
Subordinated Debentures	0	0
Junior Subordinated Notes	0
Fair Value, Inputs, Level 2 | Estimate of Fair Value Measurement
Assets
Cash and due from banks	0	0
Interest-earning deposits with banks	0	0
Debt Securities, Available-for-sale	5,753,463	5,210,134
Debt Securities, Held-to-maturity, Fair Value	2,122,606
FHLB stock	10,280	10,280
Loans held for sale	9,774	26,481
Loans	0	0
Liabilities
Time Deposits	430,682	338,815
FHLB Advances and FRB Borrowings	8,752	9,295
Repurchase agreements	86,013	73,859
Subordinated Debentures	10,125	35,414
Junior Subordinated Notes	9,927
Fair Value, Inputs, Level 3 | Estimate of Fair Value Measurement
Assets
Cash and due from banks	0	0
Interest-earning deposits with banks	0	0
Debt Securities, Available-for-sale	0	0
Debt Securities, Held-to-maturity, Fair Value	0
FHLB stock	0	0
Loans held for sale	0	0
Loans	10,679,349	9,720,592
Liabilities
Time Deposits	0	0
FHLB Advances and FRB Borrowings	0	0
Repurchase agreements	0	0
Subordinated Debentures	0	0
Junior Subordinated Notes	0
Interest Rate Swap | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value	24,257	46,184
Liabilities
Interest rate derivative liabilities, at fair value	24,257	46,637
Interest Rate Swap | Carrying Amount
Assets
Interest rate derivative assets, at fair value	24,257	46,184
Liabilities
Interest rate derivative liabilities, at fair value	24,257	46,637
Interest Rate Swap | Fair Value, Inputs, Level 1 | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value	0	0
Liabilities
Interest rate derivative liabilities, at fair value	0	0
Interest Rate Swap | Fair Value, Inputs, Level 2 | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value	24,257	46,184
Liabilities
Interest rate derivative liabilities, at fair value	24,257	46,637
Interest Rate Swap | Fair Value, Inputs, Level 3 | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value	0	0
Liabilities
Interest rate derivative liabilities, at fair value	0	0
Interest Rate Lock Commitments | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value	356	1,096
Interest Rate Lock Commitments | Carrying Amount
Assets
Interest rate derivative assets, at fair value	356	1,096
Interest Rate Lock Commitments | Fair Value, Inputs, Level 1 | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value	0	0
Interest Rate Lock Commitments | Fair Value, Inputs, Level 2 | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value	0	0
Interest Rate Lock Commitments | Fair Value, Inputs, Level 3 | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value	356	1,096
Forward sales contracts | Estimate of Fair Value Measurement
Liabilities
Interest rate derivative liabilities, at fair value	27	165
Forward sales contracts | Carrying Amount
Liabilities
Interest rate derivative liabilities, at fair value	27	165
Forward sales contracts | Fair Value, Inputs, Level 1 | Estimate of Fair Value Measurement
Liabilities
Interest rate derivative liabilities, at fair value	0	0
Forward sales contracts | Fair Value, Inputs, Level 2 | Estimate of Fair Value Measurement
Liabilities
Interest rate derivative liabilities, at fair value	27	165
Forward sales contracts | Fair Value, Inputs, Level 3 | Estimate of Fair Value Measurement
Liabilities
Interest rate derivative liabilities, at fair value	$ 0	$ 0