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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis The following tables present assets and liabilities measured at fair value on a recurring basis and reported on the consolidated balance sheets:
 September 30, 2020
 Level 1Level 2Level 3Total
 (in thousands)
Loans held for sale$— $93,621 $— $93,621 
Available for sale investment securities:
State and municipal securities— 926,554 — 926,554 
Corporate debt securities— 342,558 — 342,558 
Collateralized mortgage obligations— 532,473 — 532,473 
Residential mortgage-backed securities— 321,695 — 321,695 
Commercial mortgage-backed securities— 572,210 — 572,210 
Auction rate securities— — 97,990 97,990 
Total available for sale investment securities— 2,695,490 97,990 2,793,480 
Other assets:
Investments held in Rabbi Trust21,828 — — 21,828 
Derivative assets372 387,563 — 387,935 
Total assets$22,200 $3,176,674 $97,990 $3,296,864 
Other liabilities:
Deferred compensation liabilities$21,828 $— $— $21,828 
Derivative liabilities299 184,932 — 185,231 
Total liabilities$22,127 $184,932 $— $207,059 
 December 31, 2019
 Level 1Level 2Level 3Total
 (in thousands)
Loans held for sale$— $37,828 $— $37,828 
Available for sale investment securities:
State and municipal securities— 652,927 — 652,927 
Corporate debt securities— 374,957 2,400 377,357 
Collateralized mortgage obligations— 693,718 — 693,718 
Residential mortgage-backed securities— 177,312 — 177,312 
Commercial mortgage-backed securities— 494,297 — 494,297 
Auction rate securities— — 101,926 101,926 
Total available for sale investment securities— 2,393,211 104,326 2,497,537 
Other assets:
Investments held in Rabbi Trust22,213 — — 22,213 
Derivative assets230 145,365 — 145,595 
Total assets$22,443 $2,576,404 $104,326 $2,703,173 
Other liabilities:
Deferred compensation liabilities$22,213 $— $— $22,213 
Derivative liabilities199 76,447 — 76,646 
Total liabilities$22,412 $76,447 $— $98,859 
Schedule of Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Level 3 Inputs
The following table presents the changes in the Corporation’s available for sale investment securities measured at fair value on a recurring basis using unobservable inputs (Level 3):
Pooled Trust
Preferred
Securities		Single-issuer
Trust Preferred
Securities		ARCs
Three months ended September 30, 2020(in thousands)
Balance at June 30, 2020$— $— $100,859 
Sales — — — 
Unrealized adjustment to fair value (1)
— — (2,869)
Balance at September 30, 2020$— $— $97,990 
Three months ended September 30, 2019
Balance at June 30, 2019$— $2,370 $103,365 
Unrealized adjustment to fair value (1)
— (2)(67)
Discount accretion— 2 — 
Balance at September 30, 2019$— $2,370 $103,298 
Nine months ended September 30, 2020
Balance at December 31, 2019$— $2,400 $101,926 
Sales— (2,160)— 
Unrealized adjustment to fair value (1)
— (242)(3,936)
Discount accretion— 2 — 
Balance at September 30, 2020$— $— $97,990 
Nine months ended September 30, 2019
Balance at December 31, 2018$875 $2,400 $102,994 
Sales(770)— — 
Unrealized adjustment to fair value (1)
(105)(32)304 
Discount accretion— 2 — 
Balance at September 30, 2019$— $2,370 $103,298 
(1)Pooled trust preferred securities, single-issuer trust preferred securities and ARCs are classified as available for sale investment securities; as such, the unrealized adjustment to fair value was recorded as an unrealized holding gain (loss) and included as a component of "available for sale at estimated fair value" on the consolidated balance sheets.
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis The following table presents Level 3 financial assets measured at fair value on a nonrecurring basis:
 September 30, 2020December 31, 2019
 (in thousands)
Net Loans$113,073 $144,807 
OREO4,565 6,831 
MSRs (1)
29,682 45,193 
Total assets$147,320 $196,831 
Details of Book Value and Fair Value of Financial Instruments he following tables present the carrying amounts and estimated fair values of the Corporation’s financial instruments as of the periods shown. A general description of the methods and assumptions used to estimate such fair values follows:
 September 30, 2020
Estimated Fair Value
Carrying AmountLevel 1Level 2Level 3Total
(in thousands)
FINANCIAL ASSETS
Cash and cash equivalents$1,534,890 $1,534,890 $— $— $1,534,890 
FRB and FHLB stock93,964 — 93,964 — 93,964 
Loans held for sale 93,621 — 93,621 — 93,621 
AFS securities 2,793,480 — 2,695,490 97,990 2,793,480 
HTM securities304,241 — 324,940 — 324,940 
Net Loans 18,761,796 — — 18,514,547 18,514,547 
Accrued interest receivable70,766 70,766 — — 70,766 
Other assets 694,442 272,632 387,563 34,247 694,442 
FINANCIAL LIABILITIES  
Demand and savings deposits$17,997,443 $17,997,443 $— $— $17,997,443 
Brokered deposits317,588 275,719 41,869 — 317,588 
Time deposits2,415,020 — 2,442,422 — 2,442,422 
Short-term borrowings611,727 611,727 — — 611,727 
Accrued interest payable9,123 9,123 — — 9,123 
FHLB advances and long-term debt1,296,012 — 1,342,192 — 1,342,192 
Other liabilities 352,740 152,272 184,935 15,533 352,740 
December 31, 2019
Estimated Fair Value
Carrying AmountLevel 1Level 2Level 3Total
(in thousands)
FINANCIAL ASSETS
Cash and cash equivalents$517,791 $517,791 $— $— $517,791 
FRB and FHLB stock97,422 — 97,422 — 97,422 
Loans held for sale 37,828 — 37,828 — 37,828 
AFS securities 2,497,537 — 2,393,211 104,326 2,497,537 
HTM securities369,841 — 383,705 — 383,705 
Net Loans16,673,904 — — 16,485,122 16,485,122 
Accrued interest receivable60,898 60,898 — — 60,898 
Other assets 431,565 234,176 145,365 52,024 431,565 
FINANCIAL LIABILITIES  
Demand and savings deposits$14,327,453 $14,327,453 $— $— $14,327,453 
Brokered deposits264,531 223,982 40,549 — 264,531 
Time deposits2,801,930 — 2,828,988 — 2,828,988 
Short-term borrowings883,241 883,241 — — 883,241 
Accrued interest payable8,834 8,834 — — 8,834 
FHLB advances and long-term debt881,769 — 878,385 — 878,385 
Other liabilities 221,542 142,508 76,447 2,587 221,542