Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Schedule of AOCI

The following table summarizes the changes within each classification of AOCI, net of tax:

(dollars in thousands)	Unrealized Gains and Losses on Available- for-Sale Debt Securities		Unrealized Gains and Losses on Held-to- Maturity Securities		Gains and Losses on Cash Flow Hedges		Defined Benefit Pension Plans		Total
Year Ended December 31, 2020
Balance at beginning of period	$	56,131	$	—	$	240	$	(164)	$	56,207
Other comprehensive income (loss) before       reclassifications	97,596		—		6,230		—		103,826
Amounts reclassified from AOCI to income (1)	(8,392)		—		(3,886)		16		(12,262)
Balance at end of period	$	145,335	$	—	$	2,584	$	(148)	$	147,771
Year Ended December 31, 2019
Balance at beginning of period	$	(37,348)	$	(8,515)	$	1,099	$	(186)	$	(44,950)
Other comprehensive income (loss) before       reclassifications	94,964		6,419		(410)		—		100,973
Amounts reclassified from AOCI (1)	(1,485)		2,096		(449)		22		184
Balance at end of period	$	56,131	$	—	$	240	$	(164)	$	56,207
Year Ended December 31, 2018
Balance at beginning of period	$	(35,557)	$	(12,107)	$	(2,337)	$	(271)	$	(50,272)
Amount reclassified from AOCI to retained       earnings for cumulative effect of       change in accounting principle	—		—		(52)		—		(52)
Amounts reclassified from AOCI to retained       earnings related to the Tax Cuts and Jobs       Act of 2017	(7,583)		(2,600)		(509)		(59)		(10,751)
Other comprehensive income (loss) before       reclassifications	7,454		4,514		3,884		—		15,852
Amounts reclassified from AOCI (1)	(1,662)		1,678		113		144		273
Balance at end of period	$	(37,348)	$	(8,515)	$	1,099	$	(186)	$	(44,950)

(1)See table below for details about reclassifications to income.

Reclassifications out of Accumulated Other Comprehensive Income (Loss)

The following table summarizes the significant amounts reclassified out of each component of AOCI:

Details about AOCI Components	Amount Reclassified from AOCI						Affected Line Item in the Statement of Income
	Years Ended December 31,
(dollars in thousands)	2020		2019		2018
Unrealized gains and losses on    available-for-sale debt securities	$	10,767	$	1,923	$	2,060	Debt securities gains (losses), net
	(2,375)		(438)		(398)		Income tax (expense) benefit
	$	8,392	$	1,485	$	1,662	Net income
Unrealized gains and losses on    held-to-maturity securities	$	—	$	(2,812)	$	(2,181)	Interest income (expense)
	—		716		503		Income tax (expense) benefit
	$	—	$	(2,096)	$	(1,678)	Net income
Gains and losses on cash flow hedges    Interest rate contracts	$	5,153	$	596	$	(150)	Interest income (expense)
	(1,267)		(147)		37		Income tax (expense) benefit
	$	3,886	$	449	$	(113)	Net income
Amortization of defined benefit    pension items
Actuarial gains (losses)	$	(21)	$	(30)	$	(191)	Salaries and employee benefits
	5		8		47		Income tax (expense) benefit
	$	(16)	$	(22)	$	(144)	Net income
Total reclassifications for the period	$	12,262	$	(184)	$	(273)	Net income