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Securities (Tables)

12 Months Ended

Dec. 31, 2020

Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]

Amortized Cost and Fair Value of Debt Securities Available for Sale

Securities Available for Sale
		December 31, 2020																				December 31, 2019
							Gross					Gross															Gross					Gross
		Amortized					Unrealized					Unrealized					Fair					Amortized					Unrealized					Unrealized					Fair
(in thousands)		Cost					Gains					Losses					Value					Cost					Gains					Losses					Value
U.S. Treasury and government agency    securities		$		207,365			$		6,289			$		284			$		213,370			$		98,320			$		652			$		300			$		98,672
Municipal obligations				309,342					17,536					153					326,725					242,016					7,789					—					249,805
Residential mortgage-backed securities				2,560,249					69,570					8					2,629,811					1,910,909					20,268					7,020					1,924,157
Commercial mortgage-backed securities				2,323,306					135,516					3,288					2,455,534					1,570,765					19,880					4,178					1,586,467
Collateralized mortgage obligations				354,472					7,651					—					362,123					807,600					3,757					3,142					808,215
Corporate debt securities				11,500					264					—					11,764					8,000					21					33					7,988
		$		5,766,234			$		236,826			$		3,733			$		5,999,327			$		4,637,610			$		52,367			$		14,673			$		4,675,304

Amortized Cost and Fair Value of Debt Securities Held to Maturity

Securities Held to Maturity
		December 31, 2020																				December 31, 2019
							Gross					Gross															Gross					Gross
		Amortized					Unrealized					Unrealized					Fair					Amortized					Unrealized					Unrealized					Fair
(in thousands)		Cost					Gains					Losses					Value					Cost					Gains					Losses					Value
U.S. Treasury and government agency    securities		$		—			$		—			$		—			$		—			$		50,000			$		3			$		—			$		50,003
Municipal obligations				627,019					51,408					2					678,425					641,019					27,146					69					668,096
Residential mortgage-backed securities				21,951					1,469					—					23,420					29,687					883					—					30,570
Commercial mortgage-backed securities				549,686					54,587					—					604,273					539,371					12,474					581					551,264
Collateralized mortgage obligations				158,514					2,949					—					161,463					307,932					3,597					458					311,071
		$		1,357,170			$		110,413			$		2			$		1,467,581			$		1,568,009			$		44,103			$		1,108			$		1,611,004

Proceeds from Gross Gains on and Gross Losses on Sale of Securities

The following table presents the proceeds from, gross gains on, and gross losses on sales of securities during the years ended December 31, 2020, 2019 and 2018:

		Years Ended December 31,
(in thousands)		2020				2019				2018
Proceeds		$	211,919			$	268,413			$	455,162
Gross gains			1,984				—				—
Gross losses			1,496				—				25,480

Available for Sale Securities [Member]

Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]

Amortized Cost and Fair Value of Debt Securities by Contractual Maturity

(in thousands)		Amortized Cost					Fair Value
Debt Securities Available for Sale
Due in one year or less		$		3,810			$		3,810
Due after one year through five years				240,883					260,170
Due after five years through ten years				2,457,451					2,587,529
Due after ten years				3,064,090					3,147,818
Total available for sale debt securities		$		5,766,234			$		5,999,327

Securities with Unrealized Losses

Available for sale
		Losses < 12 Months										Losses 12 Months or >										Total
							Gross										Gross										Gross
		Fair					Unrealized					Fair					Unrealized					Fair					Unrealized
(in thousands)		Value					Losses					Value					Losses					Value					Losses
U.S. Treasury and government agency securities		$		35,845			$		284			$		—			$		—			$		35,845			$		284
Municipal obligations				30,170					153					—					—					30,170					153
Residential mortgage-backed securities				530					2					760					6					1,290					8
Commercial mortgage-backed securities				446,190					3,288					—					—					446,190					3,288
Collateralized mortgage obligations				70					—					—					—					70					—
Corporate debt securities				2,000					—					—					—					2,000					—
.		$		514,805			$		3,727			$		760			$		6			$		515,565			$		3,733

Available for sale
		Losses < 12 Months										Losses 12 Months or >										Total
							Gross										Gross										Gross
		Fair					Unrealized					Fair					Unrealized					Fair					Unrealized
(in thousands)		Value					Losses					Value					Losses					Value					Losses
U.S. Treasury and government agency securities		$		28,235			$		300			$		—			$		—			$		28,235			$		300
Municipal obligations				—					—					—					—					—					—
Residential mortgage-backed securities				420,066					5,042					399,787					1,978					819,853					7,020
Commercial mortgage-backed securities				458,855					3,971					14,896					207					473,751					4,178
Collateralized mortgage obligations				89,689					1,315					184,389					1,827					274,078					3,142
Corporate debt securities				1,467					33					—					—					1,467					33
		$		998,312			$		10,661			$		599,072			$		4,012			$		1,597,384			$		14,673

Held-to-maturity Securities [Member]

Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]

Amortized Cost and Fair Value of Debt Securities by Contractual Maturity

(in thousands)		Amortized Cost					Fair Value
Debt Securities Held to Maturity
Due in one year or less		$		2,192			$		2,190
Due after one year through five years				204,134					218,501
Due after five years through ten years				636,268					702,412
Due after ten years				514,576					544,478
Total held to maturity debt securities		$		1,357,170			$		1,467,581

Securities with Unrealized Losses

Held to maturity
		Losses < 12 Months										Losses 12 Months or >										Total
							Gross										Gross										Gross
		Fair					Unrealized					Fair					Unrealized					Fair					Unrealized
(in thousands)		Value					Losses					Value					Losses					Value					Losses
U.S. Treasury and government agency securities		$		—			$		—			$		—			$		—			$		—			$		—
Municipal obligations				—					—					2,381					2					2,381					2
Residential mortgage-backed securities				—					—					—					—					—					—
Commercial mortgage-backed securities				—					—					—					—					—					—
Collateralized mortgage obligations				—					—					—					—					—					—
		$		—			$		—			$		2,381			$		2			$		2,381			$		2

Held to maturity
		Losses < 12 Months										Losses 12 Months or >										Total
							Gross										Gross										Gross
		Fair					Unrealized					Fair					Unrealized					Fair					Unrealized
(in thousands)		Value					Losses					Value					Losses					Value					Losses
U.S. Treasury and government agency securities		$		—			$		—			$		—			$		—			$		—			$		—
Municipal obligations				4,735					38					3,143					31					7,878					69
Residential mortgage-backed securities				—					—					—					—					—					—
Commercial mortgage-backed securities				28,426					581					—					—					28,426					581
Collateralized mortgage obligations				—					—					49,110					458					49,110					458
		$		33,161			$		619			$		52,253			$		489			$		85,414			$		1,108

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Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5B
-URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269825-111563

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