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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Investment Securities Portfolio
The following table summarizes the amortized cost and fair value of the available-for-sale investment securities portfolio and the corresponding amounts of unrealized gains, unrealized losses, and basis adjustments recognized in accumulated other comprehensive income (loss):
(dollars in thousands)Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Basis AdjustmentsFair
Value
December 31, 2020
Available-for-Sale
U.S. Treasury$9,909 $299 $— $— $10,208 
U.S. government-sponsored entities and agencies841,133 5,744 (3,921)(968)841,988 
Mortgage-backed securities - Agency3,249,002 91,086 (990)— 3,339,098 
States and political subdivisions1,405,868 86,325 (31)— 1,492,162 
Pooled trust preferred securities13,763 — (5,850)— 7,913 
Other securities265,079 14,260 (593)— 278,746 
Total available-for-sale securities$5,784,754 $197,714 $(11,385)$(968)$5,970,115 
December 31, 2019
Available-for-Sale
U.S. Treasury$17,567 $117 $(2)$— $17,682 
U.S. government-sponsored entities and agencies596,595 1,027 (4,638)— 592,984 
Mortgage-backed securities - Agency3,151,550 41,363 (9,052)— 3,183,861 
States and political subdivisions1,232,497 44,193 (1,047)— 1,275,643 
Pooled trust preferred securities13,811 — (5,589)— 8,222 
Other securities301,189 6,842 (1,332)— 306,699 
Total available-for-sale securities$5,313,209 $93,542 $(21,660)$— $5,385,091 
Schedule of Proceeds from Sales or Calls and Realized Gain and Losses of Available-for-Sale Investment Securities and Other Securities
Proceeds from sales or calls of available-for-sale investment securities, the resulting realized gains and realized losses, and other securities gains or losses were as follows:
Years Ended December 31,
(dollars in thousands)202020192018
Proceeds from sales of available-for-sale debt securities$299,885 $424,140 $139,364 
Proceeds from calls of available-for-sale debt securities465,179 441,851 32,437 
Total$765,064 $865,991 $171,801 
Realized gains on sales of available-for-sale debt securities$11,172 $4,620 $3,259 
Realized gains on calls of available-for-sale debt securities121 93 283 
Realized losses on sales of available-for-sale debt securities(500)(2,760)(1,469)
Realized losses on calls of available-for-sale debt securities(26)(30)(63)
Other securities gains (losses) (1)— — 50 
Debt securities gains (losses), net$10,767 $1,923 $2,060 
(1)Other securities gains (losses) in 2018 included realized gains and losses of equity securities previously classified as trading securities.  For 2020 and 2019, gains (losses) on equity securities are included in other income.
Expected Maturities of Investment Securities Portfolio Weighted average yield is based on amortized cost.
At December 31, 2020
(dollars in thousands)Amortized
Cost		Fair
Value		Weighted
Average
Yield
Maturity
Available-for-Sale
Within one year$353,414 $358,852 2.61 %
One to five years2,828,719 2,922,695 2.27 %
Five to ten years1,029,340 1,049,684 1.98 %
Beyond ten years1,573,281 1,638,884 2.90 %
Total$5,784,754 $5,970,115 2.41 %
Available-for-Sale and Held-to-Maturity Investment Securities with Unrealized Losses by Aggregated Major Security Type and Length of Time in Continuous Unrealized Loss Position
The following table summarizes the available-for-sale investment securities with unrealized losses for which an allowance for credit losses has not been recorded by aggregated major security type and length of time in a continuous unrealized loss position:
Less than 12 months12 months or longerTotal
(dollars in thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized Losses
December 31, 2020
Available-for-Sale
U.S. government-sponsored entities
   and agencies		$355,528 $(3,921)$— $— $355,528 $(3,921)
Mortgage-backed securities - Agency275,833 (895)3,572 (95)279,405 (990)
States and political subdivisions3,497 (31)— — 3,497 (31)
Pooled trust preferred securities—— 7,913 (5,850)7,913 (5,850)
Other securities19,404 (70)24,871 (523)44,275 (593)
Total available-for-sale$654,262 $(4,917)$36,356 $(6,468)$690,618 $(11,385)
December 31, 2019
Available-for-Sale
U.S. Treasury$999 $(2)$— $— $999 $(2)
U.S. government-sponsored entities
   and agencies		357,647 (4,638)— — 357,647 (4,638)
Mortgage-backed securities - Agency786,245 (6,122)212,056 (2,930)998,301 (9,052)
States and political subdivisions120,166 (1,016)7,006 (31)127,172 (1,047)
Pooled trust preferred securities——8,222 (5,589)8,222 (5,589)
Other securities30,765 (182)87,066 (1,150)117,831 (1,332)
Total available-for-sale$1,295,822 $(11,960)$314,350 $(9,700)$1,610,172 $(21,660)
Trust Preferred Securities
The table below summarizes the relevant characteristics of our pooled trust preferred securities as well as our single issuer trust preferred securities that are included in the “other securities” category in this footnote.  Each of the pooled trust preferred securities support a more senior tranche of security holders.  Both pooled trust preferred securities have experienced credit defaults.  However, we believe that the value of the instruments lies in the full and timely interest payments that will be received through maturity, the steady amortization that will be experienced until maturity, and the full return of principal by the final maturity of the collateralized debt obligations.
(dollars in thousands)ClassLowest
Credit
Rating (1)		Amortized
Cost		Fair
Value		Unrealized
Gain/
(Loss)		# of Issuers
Currently
Performing/
Remaining		Actual
Deferrals
and Defaults
as a % of
Original
Collateral		Expected
Defaults as
a % of
Remaining
Performing
Collateral		Excess
Subordination
as a % of
Current
Performing
Collateral
December 31, 2020
Pooled trust preferred securities:
Pretsl XXVII LTDBB$4,223 $2,331 $(1,892)
32/41
14.4 %10.8%35.1%
Trapeza Ser 13AA2ABBB9,540 5,582 (3,958)
39/41
4.5 %6.4%52.0%
13,763 7,913 (5,850)
Single Issuer trust preferred securities:
JP Morgan Chase & CoBBB-4,809 4,463 (346)
Total$18,572 $12,376 $(6,196)
(1)    Lowest rating for the security provided by any nationally recognized credit rating agency.