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Accumulated Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss)
 
The components of other comprehensive income (loss), reclassifications from accumulated other comprehensive income (loss) to various financial statement line items and the related tax effects were as follows:
(In thousands)Before TaxTax EffectNet of Tax
Year Ended December 31, 2020:   
Net unrealized gains (losses) on available-for-sale investment securities and interest-only strips:
Net unrealized gains (losses) arising during the period$164,863 $(39,674)$125,189 
Reclassification of net (gains) losses from accumulated other comprehensive income (loss) to:
Total interest income3,827 (885)2,942 
Net gains (losses) on investment securities(2,309)549 (1,760)
Other noninterest expense29 (10)19 
Amounts reclassified from accumulated other comprehensive income (loss)1,547 (346)1,201 
Net unrealized gains (losses) on available-for-sale investment securities and interest-only strips
166,410 (40,020)126,390 
Recognized postretirement prior service cost:   
Net unrealized gains (losses) arising during the period 449 (107)342 
Reclassification of amortization of prior service cost to other noninterest expense
(46)11 (35)
Net unrealized gains (losses) on recognized postretirement prior service cost403 (96)307 
Net unrealized gains (losses) on net investment hedges(5,452)1,257 (4,195)
Foreign currency translation adjustment(1)
5,894 — 5,894 
Total other comprehensive income (loss)$167,255 $(38,859)$128,396 
Year Ended December 31, 2019:   
Net unrealized gains (losses) on available-for-sale investment securities and interest-only strips:
Net unrealized gains (losses) arising during the period$109,403 $(25,707)$83,696 
Reclassification of net (gains) losses from accumulated other comprehensive income (loss) to:
Total interest income2,644 (716)1,928 
Net gains (losses) on investment securities(1,517)369 (1,148)
Other noninterest expense(485)129 (356)
Amounts reclassified from accumulated other comprehensive income (loss)642 (218)424 
Net unrealized gains (losses) on available-for-sale investment securities and interest-only strips
110,045 (25,925)84,120 
Recognized postretirement prior service cost:   
Reclassification of amortization of prior service cost to other noninterest expense
(46)13 (33)
Net unrealized gains (losses) on net investment hedges(7,001)1,815 (5,186)
Foreign currency translation adjustment(1)
8,514 — 8,514 
Total other comprehensive income (loss)$111,512 $(24,097)$87,415 
Year Ended December 31, 2018:
Net unrealized gains (losses) on available-for-sale investment securities and interest-only strips:
Unrealized gains (losses) arising during the period$(16,373)$4,002 $(12,371)
Reclassification of net (gains) losses from accumulated other comprehensive income (loss) to:
Total interest income1,066 (335)731 
Gains (losses) on debt securities, net(127)31 (96)
Other noninterest expense90 (23)67 
Amounts reclassified from accumulated other comprehensive income (loss)1,029 (327)702 
Net unrealized gains (losses) on available-for-sale investment securities and interest-only strips
(15,344)3,675 (11,669)
Recognized postretirement prior service cost:   
Reclassification of amortization of prior service cost to other noninterest expense
(46)12 (34)
Net unrealized gains (losses) on net investment hedges13,762 (3,312)10,450 
Foreign currency translation adjustment(1)
(13,368)— (13,368)
Total other comprehensive income (loss)$(14,996)$375 $(14,621)
(1)Foreign investments are deemed to be permanent in nature and, therefore, TCF does not provide for taxes on foreign currency translation adjustments.
Reclassifications of net (gains) losses from accumulated other comprehensive income (loss) for available-for-sale investment securities and interest-only strips were recorded in the Consolidated Statements of Income in interest income for those investment securities that were previously transferred to held-to-maturity, in net gains on investment securities for sales of available-for-sale investment securities and in other noninterest expense for interest-only strips. During 2014, the Corporation transferred $191.7 million of available-for-sale mortgage-backed investment securities to held-to-maturity. At December 31, 2020 and 2019, the unrealized holding loss on the transferred investment securities retained in accumulated other comprehensive income (loss) totaled $4.5 million and $8.4 million, respectively. These amounts are amortized over the remaining lives of the transferred investment securities. The tax effects of the reclassifications included in the table above were recorded in income tax expense (benefit) in the Consolidated Statements of Income.
 
The components of accumulated other comprehensive income (loss) were as follows:
(In thousands)Net Unrealized Gains (Losses) on Available-for-Sale Investment Securities and Interest-only StripsNet Unrealized Gains (Losses) on Net
Investment
Hedges		Foreign
Currency
Translation Adjustment		Recognized
Postretirement Prior
Service Cost 		Total
At or For the Year Ended December 31, 2020:     
Balance, beginning of period$56,098 $9,800 $(11,697)$76 $54,277 
Other comprehensive income (loss)125,189 (4,195)5,894 342 127,230 
Amounts reclassified from accumulated other comprehensive income (loss)
1,201 — — (35)1,166 
Net other comprehensive income (loss)126,390 (4,195)5,894 307 128,396 
Balance, end of period$182,488 $5,605 $(5,803)$383 $182,673 
At or For the Year Ended December 31, 2019:     
Balance, beginning of period$(28,022)$14,986 $(20,211)$109 $(33,138)
Other comprehensive income (loss)83,696 (5,186)8,514 — 87,024 
Amounts reclassified from accumulated other comprehensive income (loss)
424 — — (33)391 
Net other comprehensive income (loss)84,120 (5,186)8,514 (33)87,415 
Balance, end of period$56,098 $9,800 $(11,697)$76 $54,277 
At or For the Year Ended December 31, 2018:     
Balance, beginning of period$(16,353)$4,536 $(6,843)$143 $(18,517)
Other comprehensive income (loss)(12,371)10,450 (13,368)— (15,289)
Amounts reclassified from accumulated other comprehensive income (loss)
702 — — (34)668 
Net other comprehensive income (loss)(11,669)10,450 (13,368)(34)(14,621)
Balance, end of period$(28,022)$14,986 $(20,211)$109 $(33,138)