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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND MARKETABLE EQUITY SECURITIES - Summary of Securities Available for Sale and Held to Maturity (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Securities available for sale    
Amortized Cost $ 1,363,702 $ 1,297,339
Gross Unrealized Gains 44,677 16,503
Gross Unrealized Losses (4,521) (2,287)
Securities available for sale, at fair value 1,403,858 1,311,555
Allowance 0 0
Securities held to maturity    
Amortized Cost 336,802 357,979
Gross Unrealized Gains 21,693 16,263
Gross Unrealized Losses (79) (965)
Fair Value 358,416 373,277
Allowance (141) 0
Marketable equity securities, amortized cost 34,288 37,138
Marketable equity securities, gross unrealized gains 1,912 5,147
Marketable equity securities, gross unrealized losses (3,917) (729)
Marketable equity securities, fair value 32,283 41,556
Total, amortized cost basis 1,734,792 1,692,456
Total, gross unrealized gain 68,282 37,913
Total, gross unrealized loss (8,517) (3,981)
Total, fair value 1,794,557 1,726,388
Total, Allowance (141) 0
Municipal bonds and obligations    
Securities available for sale    
Amortized Cost 108,279 104,325
Gross Unrealized Gains 5,936 5,813
Gross Unrealized Losses (144) 0
Securities available for sale, at fair value 114,071 110,138
Allowance 0 0
Securities held to maturity    
Amortized Cost 247,211 252,936
Gross Unrealized Gains 14,288 13,095
Gross Unrealized Losses 0 (5)
Fair Value 261,499 266,026
Allowance (83) 0
Agency collateralized mortgage obligations    
Securities available for sale    
Amortized Cost 774,281 742,550
Gross Unrealized Gains 26,903 6,431
Gross Unrealized Losses 0 (169)
Securities available for sale, at fair value 801,184 748,812
Allowance 0 0
Securities held to maturity    
Amortized Cost 69,050 69,667
Gross Unrealized Gains 6,582 2,870
Gross Unrealized Losses 0 (50)
Fair Value 75,632 72,487
Allowance 0 0
Agency mortgage-backed securities    
Securities available for sale    
Amortized Cost 139,149 146,589
Gross Unrealized Gains 4,273 1,515
Gross Unrealized Losses (94) (360)
Securities available for sale, at fair value 143,328 147,744
Allowance 0 0
Securities held to maturity    
Amortized Cost 6,070 6,271
Gross Unrealized Gains 185 29
Gross Unrealized Losses 0 0
Fair Value 6,255 6,300
Allowance 0 0
Agency commercial mortgage-backed securities    
Securities available for sale    
Amortized Cost 189,253 148,066
Gross Unrealized Gains 6,178 176
Gross Unrealized Losses (710) (1,146)
Securities available for sale, at fair value 194,721 147,096
Allowance 0 0
Securities held to maturity    
Amortized Cost 10,337 10,353
Gross Unrealized Gains 638 51
Gross Unrealized Losses 0 0
Fair Value 10,975 10,404
Allowance 0 0
Corporate bonds    
Securities available for sale    
Amortized Cost 97,125 115,395
Gross Unrealized Gains 207 1,788
Gross Unrealized Losses (3,043) (607)
Securities available for sale, at fair value 94,289 116,576
Allowance 0 0
Trust preferred securities    
Securities available for sale    
Amortized Cost 5,987  
Gross Unrealized Gains 29  
Gross Unrealized Losses (524)  
Securities available for sale, at fair value 5,492  
Tax advantaged economic development bonds    
Securities held to maturity    
Amortized Cost 3,838 18,456
Gross Unrealized Gains 0 218
Gross Unrealized Losses (79) (910)
Fair Value 3,759 17,764
Allowance (58) 0
Other bonds and obligations    
Securities available for sale    
Amortized Cost 49,628 40,414
Gross Unrealized Gains 1,151 780
Gross Unrealized Losses (6) (5)
Securities available for sale, at fair value 50,773 41,189
Allowance 0 0
Securities held to maturity    
Amortized Cost 296 296
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 296 296
Allowance $ 0 $ 0