Fair Value Measurement (Schedule Of Carrying Value And Fair Value Of Financial Instruments Not Recorded At Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financial assets:
Equity and other investment securities	$ 81,214	$ 83,077
Investment securities available for sale	3,870,435	2,932,558
Investment securities held to maturity	2,744	3,034
Loans held for sale, at fair value	353,105	688,079
Loans and leases, net	22,304,768	21,450,966
Restricted equity securities	10,916	41,666
Residential mortgage servicing rights	123,615	92,907	$ 115,010	$ 169,025
Bank owned life insurance	327,745	323,470
Derivatives	177,423	342,510
Financial liabilities:
Deposits	26,594,685	24,622,201	$ 22,481,504
Securities sold under agreements to repurchase	492,247	375,384
Borrowings	6,329	771,482
Junior subordinated debentures, at fair value	293,081	255,217
Junior subordinated debentures, at amortized cost	88,041	88,268
Derivatives	9,675	8,782
Carrying Value
Financial assets:
Cash and cash equivalents	2,761,621	2,573,181
Equity and other investment securities	81,214	83,077
Investment securities available for sale	3,870,435	2,932,558
Investment securities held to maturity	2,744	3,034
Loans held for sale, at fair value	353,105	766,225
Loans and leases, net	22,304,768	21,450,966
Restricted equity securities	10,916	41,666
Residential mortgage servicing rights	123,615	92,907
Bank owned life insurance	327,745	323,470
Derivatives	177,423	342,510
Financial liabilities:
Deposits	26,594,685	24,622,201
Securities sold under agreements to repurchase	492,247	375,384
Borrowings	6,329	771,482
Junior subordinated debentures, at fair value	293,081	255,217
Junior subordinated debentures, at amortized cost	88,041	88,268
Derivatives	9,675	8,782
Estimated Fair Value
Financial assets:
Cash and cash equivalents	2,761,621	2,573,181
Equity and other investment securities	81,214	83,077
Investment securities available for sale	3,870,435	2,932,558
Investment securities held to maturity	3,514	3,883
Loans held for sale, at fair value	353,105	766,225
Loans and leases, net	22,356,321	21,904,189
Restricted equity securities	10,916	41,666
Residential mortgage servicing rights	123,615	92,907
Bank owned life insurance	327,745	323,470
Derivatives	177,423	342,510
Financial liabilities:
Deposits	26,593,521	24,641,876
Securities sold under agreements to repurchase	492,247	375,384
Borrowings	7,073	774,586
Junior subordinated debentures, at fair value	293,081	255,217
Junior subordinated debentures, at amortized cost	75,199	67,425
Derivatives	$ 9,675	$ 8,782