Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized cost within one year	$ 40,750	$ 37,386
Amortized cost one to five years	41,840	41,230
Amortized cost for five to ten years	116,279	117,004
Amortized cost for after ten years	337,486	213,574
Available for sale	536,355	409,194
Amortized Cost	899,541	822,089
Within one year, amortized cost	11,255	7,811
One to five years, amortized cost	48,178	56,037
Five to ten years, amortized cost	89,212	94,756
After ten years, amortized cost	27,308	32,163
Total amortized cost	175,953	190,767
Investment securities, held to maturity	190,935	207,899
Fair value within one year	40,838	37,321
Fair value for one to five years	43,156	41,293
Fair value for five to ten years	125,049	122,145
Fair value for after ten years	351,506	218,193
Total fair value	560,549	418,952
Within one year, fair value	11,308	7,874
One to five years, fair value	49,597	57,048
five to ten years, fair value	95,232	98,480
After ten years, fair value	30,224	34,440
Total fair value	186,361	197,842
Fair Value	201,818	215,147
Fair Value	935,140	834,776
Federal agency collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Available for sale	219,431	267,272
Amortized Cost	219,431	267,272
Investment securities, held to maturity	3,006	4,560
Fair Value	3,095	4,568
Fair Value	225,805	269,252
Federal agency mortgage-backed pools
Schedule of Available-for-sale Securities [Line Items]
Available for sale	143,755	145,623
Amortized Cost	143,755	145,623
Investment securities, held to maturity	11,976	12,572
Fair Value	12,362	12,737
Fair Value	$ 148,786	$ 146,572

Available for sale securities debt maturities rolling fair value.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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